Limited Depending on the IRCD.... Unrealircd for example on the oline carries a flag for Override
+v or can_override
depending on whether you use old or new flags. from the unreal docs....
OperOverride are things like: joining a +ikl channel and going through bans (you need to /invite yourself first however), op'ing yourself in a channel, etc.
The can_override operflag was added as an attempt to stop oper abuse. No oper is able to override by default, you would have to give them the can_override flag explicitly