Many thanks Nicolas. I like Fabrice Niessen's work and I'm using leuven-theme, it is in my opinion very efficient to work with org-mode.
So I have tried immediately this org-acutex-keys-el.
But as I had a message error referring to the variable org-structure-template-alist , I have succeeded to customize this variable as I want, and in fact I do not need org-acutex-keys-el , all works perfectly with <key TAB, and I keep Cc-Ce to export, as usual with org-mode.
But again, thanks , to you and to Rasmus.