Blackberry OS does not have support for multiple users. Even if you could solve this problem (which I doubt), the security would be dubious at best.
is different thing, the multiple user is for application.
The bb is a work device and there are many people that use the same.
One is administrator of application, others are simple users.
When the application start ask for user and psw (of itself) and only if is an administrator, he can esc.
The problem of battery is a big problem, so i think that i need another solution.
Thank for help hrbuckley!