I'm interested to learn more about this!
Me too! No-hole rubbers sound very interesting!
Also, I think that reduced muzzle flip in the roller is mainly due to the fact that the rubbers are stretched parallel to the shaft when loaded, thereby channeling recoil directly backwards, towards the handle (as opposed to diagonally, with angled bands).
Closed muzzle euro's with a single band (parallel to shaft) would also show very little muzzle flip, and reduced recoil if ballasted properly (and if the design of the handle channels recoil to the palm of the hand effectively).
PS, I haven't tried a roller as of yet, but for our conditions, a simple single or double banded gun works well for me