I don't see any inherent reason for restricting preview repairs of repaired data to not allow specifying start and end tokens.
The restriction seems to be coming from the fact that incremental=true in RepairOption, which is the case but it's not truly an incremental repair since we're only previewing.
It would be helpful to allow this, so that operators could sequence a sweep over the entirety of the token-space in a more gradual fashion.
Also it might help in examining which portions of the token-space differ.
Can anyone see any reasons for not allowing this?
I.e just changing the above to something like: