High ground bonuses - There's some skills that really shouldn't receive it:
-Magic that already falls from the sky, or rises from the ground(the second case would actually be penalized, if logic applied).
-Magic in general, save for a few spells that explicitly fire projectiles.
-Attacks that are technically melee in range(Whirlwind, Crippling Blow, Touch of Decay, etc.).
The gist of it is that high-ground should be for the most part exclusive to ranged characters, the reason for that being that magic is already the most mechanically interesting set of skills, and anything that can be used to make archery(and melee, but that doesn't really apply her) better stand out in comparison, should be kept primarily exclusive to it.
I agree with all this, except that, if someone is standing next to a fighter that's on an elevated platform, the fighter in question should get a bonus. But only on skills/attack that use your weapon. I wouldn't imagine it being that common for two melee fighters not to be on equal platform hieght
