SDL 2.0.5 is supposed to be released soonish - I hope they provide OSX 32bit binaries again (as far as I know not providing them for 2.0.4 was an oversight). Otherwise you could build it yourself on OSX, it shouldn't be hard with the provided XCode project.
Anyway, thanks for adding X1/X2 support, looking forward to that experimental update (I'd like to bind melee shove to one of them) :-)