Contextual menu based on User/Role association

Hi,

just wondering is it possible to create (in the Extension file) a menu based on the User ID or even better the role association?

If not is it possible to create a menu based on the User Profile currently loaded?

I wan to have the possibility to define:

User A within a role AA can for example see a menu item Export, but the User B within a role AB can't see that menu item.

Is that possible?

If yes, how to do that? Using Criterions and some variables?

Regards,

Rafal