Initial version of control panel plugin and status menu plugin is here:
https://gitorious.org/community-ssu/maemo-tvout-control

It is based on tvout home plugin but with some changes. Control panel plugin only change gconf keys (/system/tvout_enable, /system/tvout, /system/aspectratio and /system/tvout_scale) and status menu plugin monitor for these changes and use tvout xv attributes for real changing status. Status menu plugin should start with hildon-desktop at startup so it also restore saved gconf values.