Almost any skill can be used in any slot by using the left and right arrows of the skill ui.
^this. The only exception is there are a *couple* skills per class that can't be bound to the right and left mouse click (because they are either big CD spells, or not meant to be spammed such as the wizards armor and so on)
On release day all fansites should have huge post on the frontpage about elective mode and "complex" tooltips.
It would help both the poor souls who didnt knew about it, and everyone else who wont have to tell about it every 5 second (if they weren't too busy playing D3 anyway).
Who is up for naming their chars and account something like Remember_Elective_mode?