it seems to me, that the project drawer does not allow automatic or manuel refreshment. [...]
It refreshes if you deactivate and activate TextMate. A gesture I think I read somewhere that users have come to expect from many programs.
Alright, I missed that feature :-) But anyway, I still think, that a preference for automatic refreshs would be a nice-to-have feature. And since the auto-refresh capablity is already there, it shouldn't be too difficult to do.
regards, christian