Yes, i wait for device ready, but after some tests, and some modifications, i can confirm that the return button listener don't work on web2app.
I have found a solution for this problem, in recoding my application.
For the orientation, i have not found how it works. No clearly documentation, and yersteday a saw that this plugin was removed from cocoon list.
So, i have not solution, and for my search in forum, you have no solution too. Maybe it is only for canvas+...
On dev app, the orientation change when i turn the device, even if the turn function of the device is off.
Thank for your reponse.