thanks for asking.

The problem with this is - as far as I can see - that the application 
switcher only stays open for as long as you keep the Command modifier 
key pressed - which is currently not possible from within Remote 
Buddy: a key press right now can not take longer than its 
corresponding button press.

You can already switch applications with Remote Buddy's Application 
Manager (in the System category), though.

Best regards, 
Felix