Paralyze doesn't work on TP moves unless it doesn't show the TP move being readied at all even. And the only mobs immune to status ailments are the old pre-SoA mobs, anything in SoA has no immunity, none of them, they only have high resist at most.
So far as the En-Enfeeble idea goes, I disagree, the only thing I can see as a decent enfeeble for En-Spells would be silence, because it has no potency. The thing is, for this to be good we would have to have a 100% land rate too.
But all in all, I think we need En-IIIs, a fusion of I & II, En-spells would be more valuable that way, also, magic damage gear should effect them too, but in the same sense that 'Sword Enhancement Spell' effects work, then they could be more powerful as well.