When deploying an application from Mendix 5 using the "Mendix 5 layout", the Id of the logged in user is shown in the menubar. When clicking on this userId a menu containing the item "Sign Out" appears. Is it possible to add menu-items (like 'My profile', 'Change password', etc.) to this menu (preferably from within the modeler)? And if so, where and how?
No this is not possible, the username widget is a special case. But the way we handle menu's will be improved anyway so I would recommend submitting feedback for this and we can take it along in our considerations.
Just to make sure, when you say Id of the user, you mean his username right?