It is not my intention to thread-jack and I hope it doesn’t seem to be so, but, since I have a suggestion that is also related to trait re-specialisation, I’d like to slip in the small suggestion that we have confirm and undo options added to the trait menu.
Currently, if, while one is allocating their trait points, a mistake is made there is no option to undo and correct your choice without having to fully re-specialise and also pay a fee. I think that having an option to confirm and/or alter your choice before it becomes active would reduce the need for unnecessary trips to the profession trainer.
Edit: Just to add that I agree with your OP and that I really like the idea to have saved builds. 
(edited by Proodle.1608)