After a few mails with WordPress plugin team (the 9th and 10th of this month), i had to review my code once again essentially to sanitize what could be sanitize (quite a few items in fact) using the WP sanitization functions.
These functions are documented in two places : here and here.
That documentation seems a bit inconsistent by the way. I looked the web as well to find the best approach. Obviously tons of links but i selected this one.
Anyway, i tried to keep the best of these worlds to deliver the best :-D .