There is also a hack by removing the comment lines in /etc/mce/mce.ini that will provide a "Top in XTerm" button in the hardware button menu. Not that "hack" really means "hack" and doing something wrong here might turn your device into a brick, but for me it works. :-P
<!-- <menuitem priority="20" name="Reboot"> <return>6</return> <po>osso-powerup-shutdown</po> </menuitem> <menuitem priority="10" name="Soft poweroff"> <return>7</return> <po>osso-powerup-shutdown</po> </menuitem> <menuitem priority="5" name="Top in XTerm"> <callback service="com.nokia.xterm" path="/com/nokia/xterm" interface="com.nokia.xter <argument type="string">/usr/bin/top</argument> </callback> </menuitem> -->