I dont know if there is an undo tempban command but I think that if there isn't, it should be "/redo tempban XXX which undoes all tempbans done in that time.

why not just use /unban? With a time unbanner there is the chance of unbanning a real griefer.

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Because assistants can't use that command

Indeed, since you'd generally have no control over who gets unbanned in that time, it's not a good idea.

Because I remember accidently tempbanning someone playing spleef and hcart.

zat iz vy vie must pay full attenzion zu vhut ve're doing zu avoid mistake. In any case just inform an op when they come online to unban them (if the time hasn't passed yet)

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Yeah, cos I was awarded MegaFailz afterwards xD

And what's with all the Z's lol