While I think having big-as-stone-button little individual cobblestones around could look nice, I think your approach, putting lots of them everywhere, would just make the world look way too cluttered.
1/5 odds is a LOT. Think of a chessboard and put dimes on 13 of the 64 squares. No imagine the minecraft word looking everywhere like that. That's way too crowded!
I suggest instead having occasionnal patches of stones here and there. A bit like pumpkin patches: maybe 2 to 4 times as common as pumpkin patches (and also both at the surface and in the underground), with each patch being from 1 to 16 individual stones, spread out over say a 12x12 area.
This would make the world look a little bit more varied. While in vanilla the use would be severely limited (because anyone one can go from nothing to full stone tools in minutes), mods that put more emphasis on survival and a slower rate of progress would benefit greatly from these stones. Also, decorative uses.
I'd make them small flat and square, to differentiate from the "pushable" redstone buttons.
Support, except for the frequency. Should be relatively low odds of having a reasonably-sized patch of stones per chunk, with most chunks not having any, instead of dozens upon dozens of stones per each and every chunk.
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IGN: TheHappyMan100
Age: 16
Country: United Kingdom (Specifically England)
Just looking for an active community
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IGN: TheHappyMan100
Age: 16 (I know I am under 18).
Why I would like to join the server: This sounds like a bit of fun.
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I can do landscape design if you need help. Very nice looking good, can't wait to see all the little details!
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Very random, very nice!
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Nice! Good use of variation!
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Hello my name is TheHappyMan100, just call me Happy.
I would be delighted to help on your server, I have experience and will help your server grow.
Tell me the ip and I would be Happy to help!
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Hey Fiend being looking for a good realms server so if you want a friendly experienced player to have fun with invite me my ign is: TheHappyMan100
No spaces (;