I don't understand.
It's altogether possible to create two long chests side by side without the middle two joining together. Your image (emoticons) suggest this is what you're talking about.
However, what I'm assuming you're talking about, is that you want to be able to place separate, single chests side by side?
Why? Just why? It doesn't save space, it's not more organized, and it doesn't save more space, and for the first time, that was actually put twice on accident, but I'll go with it:
In fact, if you make your room 3-4 blocks tall, you can construct your chest room like so:
Which allows for the same storage space you're thinking single chests will bring you, while still leaving room for signs to be placed directing you to the chest you want, or torches/redstone lamps to provide pleasant lighting, or in the case of lamps, both.
What is so wrong about chests joining side by side? I still don't understand this, if there are perfectly fine (and in some cases, more aesthetically pleasing) methods of creating storage rooms?
Want even more efficiency? Try storage carts. A while back I half-finished a system that would relay specific carts at the push of a button (although the idea itself was pretty much copied from the Batcave world and remade to suit my own tastes).
There are easy and complicated ways to store things in an organized fashion. Utilize all the tools at your advantage, don't assume that because you can't place chests side by side that you're immediately forced to construct some gigantically long room to dump all your cobble, all it requires you to do is build your ceiling a single block higher. Frankly that kind of height looks better anyway, so I don't see any problem.
Long overdue edit: Oh, I see what you're talking about now. Yes, it would probably be useful to allow two large chests to be placed next to each other. I apologize, I wasn't able to test anything on my laptop.
not anymore if you shift-right click
how about they don't join unless you shift-right click on the first chest and shift-right clicking on a double chest it just places it i found it kind of weird that just placing a chest adjacent to another joined them when you did nothing to the first chest
Meaning the game can't tell them apart. Which is completely untrue. If the game checks to see that there is a double chest there and doesn't allow you to place another Chest, it should be able to allow you to place a chest and force it to act as a single chest rather than trying to link automatically. This is definitely possible, Chests just need to be worked around.
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