Basically yes, but the UI looks broken for that - it is not in the automated tests yet. So let me check it soon and I come back with that.
We had 5% and the main reason is, that it looked ugly. But let me try again. What already should definitely work is to do this via cli - but let me first check this out. The basics are implemented.
Repartitioning was planned anyway. but it is a complicated beast, I guess, we cannot 100% guarantee, that it will be fool proof: if you repartition very “tight” while a sync is not complete, this may be messed up. So the sosadmin has to take minimal care… but maybe we have a better idea somehow