Slimes, any possible events for onTarget with a player?

I today, just found that slimes do not throw a EntityTargetEvent. I can understand the reasoning "a event every tick would be a bit much." But a event that would lead to a slime targeting a player could be insanely useful.

Does anyone know of any ways around this?

I'm not sure if there are any and if not that's ok, I'll have to figure out a different way of keeping a slime from targeting a player, but without an event, I don't think that's possible.