http://www.curse.com/server-mods/minecraft/kick-vote
note that the introduction says its a plugin, but for my benefit i'm call it a mod
this is the link to the server mod just so u can check it out, i know u said u didn't want to put stress of a job on players that would take away the enjoy of the server but this mod doesn't do that it gives the players the ability to vote if there isn't a guardian on at the time, but when a guardian comes on the vote is cancelled and then the guardian can deal with the issue at hand.
here are some of the features:
Kick Votes
Temporary Ban Votes
10 Minute time limit if vote fails. - Stops people from spamming votes against the same person.
2 Minutes to vote
If everyone votes and it's a tie the vote ends in stalemate
Once the vote is more than half the players online the person is kicked / tempbanned and the vote ends
Players can only start a vote if no admins are online.
Votes running when an admin join are canceled.
Full permissions support