anyone ? :?
YAF has a 'Thanks' feature, but not a feature regarding "Answered/Solved" per say...
This has been covered in a couple other topics. You might suggest it in the Feature Requests forum for future versions, but I don't know if it is on the roadmap or ever will be.
If you can't find it using the forum search, try my signature link -- searches this site using Google:
Google is my Friend