I'll look through this guide about polarity, if I can't find a section; I'll make a section.
Below was written 3 years ago; and it's more a PRT guide than it is a FTC guide.
I'll rewrite it below the quote to reflect my current view and rationale.
I tend to not be too terribly concerned with this one as people generally give, at the very least, the facsimile of a cover sheet of a reason for partial support. In fact, this one is usually to blame with the original poster not selling his idea properly.
A properly sold suggestion (I'll define this later) will polarize your audience. You want your posters to either LOVE it or HATE it. You do NOT want partial support. Partial supporters do not champion. Partial supporters bloat their own post count, probably give you a +1, and leave, never to return. Full supporters adopt the suggestion. It is their suggestion as much as it is yours. They will fight against the haters and help make the thread better. If you get meh or partial support, it's because the audience isn't enthralled enough to like it or dislike it. Not only that, but members that aren't captured probably won't post at all. You get more coverage and better polarization when you properly sell your idea than if people are disinterested enough to press back or simply state "meh" or "partial support". They're officially in limbo.
Now, I can't exclusively paint this problem on the OP. Not everyone has the linguistic prowess of a god, and if everyone did, then we wouldn't have a need for communication, now would we?
If you say "partial support", you haven't done your job as a critic. Why are you casting only partial support? What objections are keeping you from partial support. Now, I know the OP hasn't exactly sold you for/against the idea, but what begrudging is keeping you from enjoying the idea? How can OP improve his idea so it attains the polarizing qualities you're after?
Stating "partial support" may as well be "no support" without a reason for all the good it does. I've already been over "supporting details". They are the dividing line between "post-troll" and "critic".
While partial support is not a bad thing, unless you give supporting details, you're better off not saying anything at all. I'd personally rather not see partial support as it goes back to the all-or-nothing attitude. If you're going to bother supporting something, support it all of the way, or refuse to support it all-together. Nothing sucks worse than having your idea thrown into purgatory and trying to fight for its rightful place; even worse is dying in purgatory. It's better to know if an idea sucks or if it's worth keeping around.
SELLING YOUR IDEA:
An idea is an intellectual commodity. In this case, you're selling your idea for support and time. Those who want your idea will pay you in those currencies. Those that dislike your idea will not. It's that simple.
But, if you don't know how to properly sell your idea, or you don't care who reads/dislikes/likes your idea, then you won't get any biters. Selling your idea isn't just the enthusiasm behind the idea (wouldn't that be nice); selling your idea is actually using targeted marketing techniques to grab the desired audience to the idea.
Marketing isn't a bad thing. It's what allows the companies you love to remain the companies you love. This is what keeps Coke in business, Mojang in business, etc. If it wasn't for marketing, we'd all live in a communist trade-restricted society where the yoke of the government controlled our very actions. For those that already live under those terms, I doubt you're reading this as "internet service" would likely be deemed an unnecessary luxury, if it was allowed, it'd likely be filtered to the point of oblivion; if you are reading it and living under those conditions then I doubt that this would be all-too-radical of a change for you; but for most of the world, it would mean a major structural change to the way EVERYTHING is run.
With that said, selling your idea is a targeted attack. If you want to shoot elephants, you're not going to have much luck in South America, is what I'm saying. You have to choose your target demographic and sell the idea to them.
If your idea is purely aesthetic, say so in the tag; grab the attention of those that want aesthetic items; explain how your idea would make the world better simply by existing or through a process of creation.
Selling an idea is an important part of your suggestion, without it, your idea will be in limbo. Selling an idea is usually a simple affair too, ask a question of the audience. Create a need. Tell your audience how your suggestion will fill the need. Close. Failure to do this is a failure to get thread recognition. Have fun in limbo!
PARSUP AND OTHER ROOT VEGETABLES
I totally understand the want/need/desire to have your voice heard and to give the OP as much credit as possible. Even if you don't totally buy the idea he is selling; you can at the very least say support some aspect of it, right?
Well... You can; but it's actually better to pick a stance. Partial Support (which I derogate as parsup) doesn't really help OP. It's a very flimsy and wishwashy stance; and an argument of minimum sufficient strength of a passing breeze is usually enough to send the stance into a support or no support.
Instead of being flippant and thin skinned about your opinion; choose a side. Either you LIKE the suggestion enough to adopt it; or you don't like it. Yes or no.
If you say that you do support; continue to guide the suggestion with possible uses; reasons for inclusion, etc. to help OP out.
If you do not support, state what you'd like OP to do to correct suggestion to where you would support. Or if you simply do not agree with the suggestion; perhaps things that others that do like the suggestion would want to see changed.
If you want to give partial support; you'll do a lot more justice just by saying "no support, but willing to change position should [conditions] be met."