[n0limit]

I could probably integrate sourcebans into the plugin, but would it really be needed? If you kept the default time (which is 5 minutes), then by the time the user went to contest his ban it'd already be expired. If you want a longer ban, then it'd probably make sense to use one of the more extended voting plugins and issuing a voteban.
Did you just want it so the user knows why he was banned?