Mathias,
MyEclipse 9.0.1 is under QA right now and unfortunately is a tad delayed due to us having to verify fixes to performance issues caused JavaScript. It is about another couple of weeks delayed at this point, but rest assured that your has already been fixed and tested.
I would also like to inform you that we have a new deployment mode coming in Blue 9.0.1 which is going to make deployment to WebSphere much faster.
I apologize for the delays caused but we are working on releasing this asap.