I flashed my n900, advanced interface switcher and advanced power are some of the apps i want to install
after many attempts and they failed to appear on the status bar, I'm able to make it works.
here's what I tried:
basically I installed advanced interface switcher reboot,
then uninstall it reboot,
reinstall again... it appear on the status bar...
and the advanced power also appear...
I don't know why but it works...
hope it helps others.