Some people take the whole suggestions forum quite too serious.
It's just meant for the players, to throw a few little ideas in for the developing process.
No one wants the players to create whole, lotta complex mechanics etc. , it wouldnt even work because we don't know the exact mechanics, the scripting and especially the ideals and goals the devs want to reach with
their game.
Creating a few sub-categories would be nice on the first thought, but on the second thought I don't think it's necessary, because of reasons named above and the fact that nearly every thread there get's derailed sooner or later and transphorms into a) flame b) a complete other topic or c) general issues chit chat.
And the reason why devs don't post in suggestion threads so often has been said already a few times, it would simply lead to even more flame, whine etc. if every suggestion would need a yay or a nay from them.
Also, it's not that they have something better to do then answering suggestion threads the whole day.
