I’m also interested in this. Since people often create forum topics in the wrong groups, it’s not usual to have to move them around (using @dwenausTopic Mover plugin). Moving the topic breaks links to it (in notification emails, activity stream, etc.)
Any suggestions on how to change the slug or how to somehow avoid this problem of broken links for moved forum topics?
Same problem here: legitimate users registering and being marked automatically as spammers.
I am running on WP3.1 with a single main blog. Any help is appreciated!
@aljuk: One thing that I did that might be of interest: only update the “active x ago” indicator when the user generates an activity that gets logged publicly (i.e. goes to the activity stream)