Very nice Support here. All other posts i found with this problem are 1.unanswered or 2 answered with not helping small-talk.
Seems that the rsg-team not able or not willing to help.

Too bad you feel this way.

You post a problem and expect an answer two hours later, that is not how it works.
We started two months ago with the migration towards J1.5.x so don't expect miracles overnight.

You do have a point when you state that no-one replies to your post, but that sometimes does happen.
Reality is that the development team also tries to maintain somewhat of a social life, so don't expect commercial grade assistance at once.

Anyway, hope your new gallery works out for you and perhaps in a few months, you will have a look at RSGallery2 again.

Cheers,

Ronald