I'd like to see a mod that tells you your permissions in each forum. Some forums do this. I got this idea from hardforum.com which has this implemented. I know other forums have it as well, but I can't think of any at the moment:
Lainaus käyttäjältä: Sample Posting rules from Hardforum.comPosting Rules
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I find this quite superfluous. Usually this is on forums that have buttons fro actions you can't perform.
In SMF things that you can't do are not visible, so only looking at a page you can tell what is that you can do.
I find it annoying to be told on each page what can or can not do. I feel like being considered stupid.