Please tell me if this is already the case, but would it make sense for
accounts which have just been blocked to have their current IP address
temporarily autoblocked (for say, 30 minutes) from creating other user
accounts. This would be in addition to the current
account-creations-per-day limit.
This would help prevent many mid-level vandals from playing the game of
repeatedly creating multiple accounts immediately after getting blocked,
and would reduce the amount of time admins currently have to spend
playing whack-a-mole with these sockpuppet accounts.
-- Neil