I'm considering how to deal with this.. I haven't had much time to go through the quests, which takes a while to do. I don't play AC any more so I'm not familiar with the new quests. For each quest that's submitted, I have to check that the triggers and timers are correct, which usually means searching on Maggie's or other sites for detailed info about the quest, plus check that it's a good and useful. Out of the past 500+ quests that were submitted, only ~100 were accepted, and many of those needed to be tweaked for things like naming consistency or triggers.
One thing I've been considering is to add a voting thumbs up/thumbs down for all of the submitted quests, so people can help me filter out the bad submissions.
Another option is to add more people as admins. Admins would need to have an attention to detail and the willingness to do all the verification and tweaking of the submitted quests to make sure that it has a good trigger, has a good name, and is a quest that people would actually want to track with Quest Timer (i.e., not a < 1 day timer, or a non-repeatable quest).
Once a quest has been approved, it'll remain in the list of downloaded quests in the plugin, even if it's later deleted from the server (this is kind of a bug). This means I usually try to be pretty sure about the quests I approve so as not to clutter up people's quest lists with bad quest timers.
One final option is to update the plugin to optionally show unapproved quests in the list of downloaded quests. This would take the most work and would require me to re-sub to AC to test the changes.
-----signature-----
[LotRO] Digero (Guardian), Digrim (Burglar), Dignite (LM), Azrea (Hunter) - Landroval
[AC] Digero, Lyera, Draxxe - Leafcull (Retired)
[CoH] Devil's Zealot, Scinta, Izzard - Guardian (Retired)
Digero's AC Decal Plugins:
http://decal.acasylum.com