Re: new version of BuddyPress Rate Forum Posts
I think it would make sense if there was a unified karma plugin. Forums are nice, but that’s only really one component of BP. I also know this means a lot more work on your part.
I don’t know what you have planned for blog post karma, but I’m guessing at some point, you’d need the thumbs up/down voting block across all blogs on a WPMU install, so it’d have to be a plugin that is activated site-wide or a plugin that resides in /wp-content/mu-plugins/. Unless you think that users should activate the plugin on certain blogs only.
Personally, I’d rather see activity karma than blog post karma, but that’s just me.