How can users change DPI and Font settings in session based RDP?

How can I allow users to chose their own DPI and Font settings in a session-based win 2008 R2 environment?

I used to block control panel access by GPO (User Configuration\Policies\Control Panel\Prohibit Access = true).

Today, I enabled "Show only Specific Control Panel items", and allowed the Microsoft.Personalization item in the control panel. (See http://go.Microsoft.Com/fwlink/?LinkID=122973)

But making this change requires administrator privileges and changed the DPI for all users.

Thanks.