Define 'skill'?

Without parsers, without actual worthwhile data about the system to work with, there's no way to determine mechanical effectiveness other than eyeballing a bunch of damage numbers flying around.

I've never played WoW, so I don't have firsthand experience with the UI addons (other than an aesthetic judgement of "they look ugly but incredibly useful, I wish I'd had stuff like this on Red Mage in FFXI"), but I'd much rather have the freedom to mod the UI than not, and it's a symbol of forward-thinking game design in general.

And, yeah, I'm pretty sure this is the mouse/keyboard interface; how many times do they have to say "there'll be two seperate UIs, one for mouse/kb and one for controller" before it gets through?