4) MES - what's wrong with it? It gives pretty good stealth. Ok, not much bonuses other then this but when you fly MVAE or some other high-end Fed escort without a cloak it can be pretty usefull for sneaking around and alpha striking your targets of choice. The only thing that suck about it is the reliance on Aux power. I would make it not dependand on power levels and apply constant stealth with the value for current 125 Aux MES. It would be good power then. Not something to be used by anyone, but good enough for those who want to sneak around.
MES would be a fantastic skill except that it breaks in combat and is pretty much a wasted slot unless you burn everything pulling out again. I've considered trying to make use of MES but it has a lot of weird mechanics (for example you get an insane defense bonus, but generally if you're coming out of cloak you're not trying to tank so what's the point?) that prevent it from having even niche or gimmick-build use.
Personally I'm not sure I'd want to see it fixed... KvK is already notorious for cloak-abuse and having people dipping in and out of cloak every game would just feel goofy.