Hmm.. Stun would set DEF to 0 so it would raep thana, idk if it would really be that good.
Silence is ridiculously easily countered using green pots, heck I had those things hotkeyed on my LR wiz.
External Bleeding isn't really worth it, plus I don't know if any player skills can inflict it.
I guess blind would be sorta useful, especially vs ranged chars, but the only thing that inflicts it that I can recall off the top of my mind is sand attack, which is close-ranged either way.