how can i change default email "firstname.lastname@example.org"?
I don't know why this wasn't done sooner, but here it is -- finally you can change that damn WordPress@ to something else without editing a file.
WordPress 2.2.x users only please. 2.1.x might work, I dont know, I didnt test it on that since you shouldn't be using it anyway, so no guarantees, and I know it won't work in 2.0.x
A 2.0.x version wouldnt be too hard to make though, certainly.