This is easily doable, look at how ICQ number and such are implemented, it leaves room for such customization.
I've the same pb with the userPortlet!
Dear STUDIE if u even customize your userPortlet so you could put your appropiate attributes, please can you tell me how or write me an email to :
I have a serious problem !
when i try to compile the UserPortlet.java and put the the new UserPortlet .class in the portal-core-lib.jar ,it doesn't work !
If anyone have customize the userportlet! please tell me how !