Excellent point about 〜がる. ^_^

I’m gonna have to go look into how 〜がる works now.

Assuming you mean, apart from 〜させたい… How about from 〜たい to 〜たがる to 〜たがらせる? Google turned up “学校に行きたがらせる” – “make (them) want to go to school” is my guess at the translation.
Of course, the fact that 〜たがる changes 〜たい into a verb suggests to me that the original is something other than a verb. This works on 欲しい, 欲しがる, so perhaps the 〜たい is an adjective after all (at least from some grammatical viewpoint).