Board Thread:Support Requests - Community Management/@comment-263488-20130508210533/@comment-3335785-20130508231342

Currently you cannot block someone on the wiki and allow them to continue to post on the forums. Theoretically, you could separate the rights and allow them to, but I'm doubtful of the possible benefits.

I haven't checked, but I very much doubt it's possible to alter kudos beyond adding or removing your own kudos.