I really like the rules at seductionmod. They are simple and straightforward. Not a lot of do this ..but don't do that. I adopted them from several games I have modded over the years and things I like.
Personally I don't like rules limiting posting size. Sometimes I can write six paragraphs for my character and sometimes I can write four words. It all depends on the mood and what is happening.
FAQ's I like to cover aspects such as game info..rules. premise...other things all tied in together. And I like when the premise and rules are short and concise but the FAQ's cover other topics not mentioned.