Starting and stopping MCE in ASUI, not going to happen. Restarting MCE causes more problems than you think, such as bringing up the device lock keypad and might cause alarmd problems.

After 0.6.0 is released I plan on adding 4 (maybe more) half widgets (the clock is a half widget, volume is a full widget) to ASUI that can each hold 2 buttons. I will also be adding 4-6 command buttons that you can set commands to run as root or user and give them a name and maybe an icon. You'll be able to move any button between the button bars and the new button widgets. Then you can put your scripts in files and call them from buttons in ASUI.

the number of button half widgets and command buttons can easily be increased if anyone thinks there should be more.