Hi Jaap,
Well I don't know about cumbersome. For me, if I am using mouse to make my selections, it is actually a smooth flow to also send the images to LR with the mouse. But everyone works in their own way. :-)
The star ratings transfer for me. Two common things to check is to make sure you have write/edit permissions on the disk where your images are. Also, go to Preferences (Cmd-comma) and under IPTC/XMP Prefs, go to the "Lightning bolt" icon in lower right and click there, selecting "Adobe products" to make sure the metadata settings are lined up between two programs. There are other issues it could be, so if neither of those are the issue you can contact our Tech Support (Free even if on trial)
http://docs.camerabits.com/ and the contact section at the middle of the page.
I hope this can get resolved so that PM actually helps you.
-Mick