Hi, Misalf. Sorry I'm so long in acknowledging your reply.
Anyway, I can try an extension (via "Download + Load") without setting it "OnBoot".
Then rebooting without making a backup will restore the same system state as it was before downloading the extension except that it still can be 'Loaded'/installed since it's stored in /tce/optional.
I'll figure this out someday <grin>.
M.