HERES AN EDITED VERSION OF WHAT I WROTE:
Here are some suggestions that I would like to suggest. Please don't kill me, and here we go.
Accented and special characters for better communication. It shouldn't be a "requirement" to be able to write and read in english to use, lets say, the forum. If you really wanted to read what some people were saying, you can just use Google Translate or something. Let people speak in their preferred language. If that isn't feasible, at least change the in-game UI displays.
An indistructible conductor that isn't a wall. Okay, maybe this is useless. I am sure stupid. Although, none of the alternatives provide the same single-layer indestructible-ness as diamond. Or at least I think there isn't an alternative. Oh, and INST needs PSCN and NSCN to work so...
Special characters. This is a good enough alternative to emoji (hooray for pixelation) and can be just as useful as regular emoji. Oh and yes, I forgot to mention that you can use special characters to make kaomoji other than :) and ;D or whatever other simple variation of those. You can make something like this: (/^?^)/ [Second edit: turns out that the triangle mouth doesn't even save in the system. It shows up as a question mark.]
Website (xyz.xyz.xyz) and save id (id:xxxxxxx) recognition in comments and descriptions. A username recognition (user:xyz) would also be useful. Although you could find whatever you are looking for, copy it, and paste it in the search bar, that is just a lot of time wasted. A link system, like the ones used in signs, could be used to make looking for things easier. They would also make them *pop* in whatever text they are in.
Hopefully somebody important sees this, like a developer or someone else that has significant power in the Powder Toy system. Oh, and have a nice day!
ORIGINAL:
Here's a short list, because I don't want to seem demanding.
Hopefully somebody important sees this, and have a nice day!
Wishlist.
Your last 3 suggestions, are... well you said it yourself, useless. Indestructible conductor = INST. Editing/Deleting comments: people could delete their comments in the middle of a flame-war or something and make the other person look bad, plus a lot of other ways to abuse this feature. Formatting text = useless.