I would personally like to be able to block tickets from being created by unknown sources. A simple deny tickets from being created from unknown or non-registered users would be great.
Reason: We get spam from many sources and not all of this gets picked up by the spam filter, over 20-40 tickets gets created over a weekend that we need to sort through and discard. We really just want customers that have registered to be able to create tickets.
Thoughts...

