You only have to reboot at each change you made in Tachyon_settings, for the rest, a power cycle will work fine.
Tachyon launcher in fact is not needed anymore, you can uninstall it by going to:
Settings > Apps > Enter on Tachyon_Launcher > Uninstall
Teamviewer's control remote is disable in Android Shield OS so we root some of our shield to enable it. Beside that and the Apply and Reboot button on Tachyon_settings everything is the same.
If you want to root your shield, I can give you some support. just let me know.