git-p4: keeping p4 and git in sync?

I've been using git-p4 to keep a git branch more-or-less tracking a 
perforce repository.

That works well with one person, but with more people it gets harder.

I'd like to get to the point where the two branches are kept in sync 
pretty much automatically, continually (modulo merge conflicts where the 
same lines are touched in git and p4 simultaneously). Right now I'm 
using "git-p4 rebase" manually.

I'm just wondering if anyone else has done this, and what 
experiences/techniques/problems they have?

Thanks
Luke