I just tried this

/cast ardent defender
/changeactionbar 2

it cast ardent defender then switch to action bar 2...

Then i went back and clicked it because ardent defender isn't ready... and it still switched to action bar 2..

So i'm going to see if i can use mercurio's macros whilst popping the dps and proc on action bars 1 and 2, and switching between them at the end of each macro!

Whaddya think??!