Well I am unsure actually, but it looks like for now it is a single registry key. However you can make an experiment: add AD group to Radmin, export key, remove AD group, repeat with another one, restore first key (so you have 2 keys) and check what happens )
Because this forum is a moderated one. The main purpose of this forum is to assist our users to find solutions for their issues. Some topics become outdated, some answers get their home elsewhere (at example on our support page) e t.c.