I don't really like this idea. I'm not a huge fan of supposed "customization" in MMOs because of the plain fact that everyone expects everyone to be the "best", so as to optimize the customization in some way. What I mean is that everyone would end up being the same as everyone else who is the same job as them because there is always some combination of the "custom" attributes that max out your character's effectiveness.

An example is like in Rift. Yes you have three separate skill trees, that you can choose which you would even like to have, and then you can choose how you would like to spend your points in said trees. Sounds wonderful, and full of personal customization. But the fact of the matter is is that this isn't true. You may want to make your character spend points equally in all three skill trees, but this is seen as useless and incredibly weak. The community has decided that to be the "best" you must really only build your skill trees in very rigid, and specific, ways. So though it may appear to allow customization at first, the community will end up pretty much trying to force people to build a specific way. if you don't build yourself up to be the strongest you can you can't possibly hope to be fully accepted in the hardest of content.

I pesonally love customizing my own character, but not in MMOs.