The only thing that would make it "cool" (in no way realistic or desirable, in some situations) would me giving Mind Sear sort of a Pestilence effect from a glyph. Like, for example... If you cast Mind Sear on a target that already has your SW:P up on it, all targets hit by Mind Sear will also become affected by that SW:P.
Insanely overpowered in some situations, yes, but it also forces you to target a mob, and not the tank, so you run a higher risk of your target dying depending on the mob health.