Become a Time Lord and regenerate!
Tested with PermissionsEx, there are a number of self-explanatory permissions:
Allow players to regenerate on death
projectrassilon.regen.timelord
Allow players to force themselves to regenerate
projectrassilon.regen.force
Allow players to block regeneration
projectrassilon.regen.block
Allow players to view their regeneration stats
This permission is given to all players by default!
projectrassilon.regen.cmd
Allow players to view another player's regeneration stats
projectrassilon.pr.view
Allow players to set another player's regeneration count
projectrassilon.pr.set
Allow players to force another player to regenerate
projectrassilon.pr.force
Allow players to block another player's regeneration
projectrassilon.pr.block
Allow players to reload the configuration files
projectrassilon.pr.reload