Auditioning output in Live

Bear with me because this is a 2 part request-

Many times the CLT or the DP want to audition several channel changes at once.
Typically its a request something like-
"Ch 1 @ 80, Ch 2 @ 65 and Ch 3@ full... Now A/B that."

I haven't found a good way to do this fast. undo/redo works but it would be nice to have a cleaner workflow. This leads me to the following requests-
 
The ability to put more than one command on the command line prior to execution

and
Holding [Shift] + [Enter] treats the command entry as an" audition" to release when [Enter] is released or store if [Shift] is released first.

-Martin