[jolepabo]

I think the solution should be a third windows for collaboration, where I had my team mates/work mates and then I can assign them a task ... whether it is synchronized via bonjour or mail (I fancy this one because this is better for people working from Home or remotely frequently).

Since they (team/work mates) own the task and I just want to do some follow-up, I think this is enough. Integration with OP is not really usefull for everyone ...