I remember reading on here that one of the reasons the Tag Synonyms privilege is to high in rep list, is due to the size of the current queue.
What if the Tag Synonyms approval process was taken to the community?
A proposal for an alias could be put up for voting
by the community for a specific amount of time. Of course, there'd be a rep requirement for those who can participate in voting.
Perhaps there could even be a way to comment and discuss alias proposals.
This would take the load off the mods, and ought to clean up the queue.