Re: Forum posts in wiki pages
I believe you can permit voting/rating of forum posts if you want some way for "top posts" to filter to the top. There are various modules that can be included in Wiki pages pertaining to forums but for the most part they are a little more generic than you require (by the sounds of things). That is to say that they are generated from overall activity rather than some kind of user flagged activity. I don't know if there's a module that displays the highest rated posts since I've never used the feature.
It sounds like something might be possible in Tiki to kind of do what you want it to do but it won't be exactly what you want. In general, Tiki is very powerful which is both a blessing and a curse, but I'm predominantly definitely on the blessing side. 
Good luck!
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