Making them repop faster is possible but is not at all easy. I'm sorry some people are being jerks about it. Wait till next week and I expect they will have left.
It is not the policy of UO to get involved in these kind of disputes between players because it is so hard to prove griefing when a person tames a bane dragon, and then starts hunting with it in the dungeon where he/she got it.
Take this as some comfort. These dragons were designed to balance with the Dread Warhorses because I kept hearing reports on these boards for the return of the DW for the sake of PVP balance. I wanted to level the playing field in PVP but not diminish the rarity of the DW. So, Bane Dragons will not be there forever, but they will be there till I'm satisfied that most people who want one had a chance to get one.