Can I run Mac App Store programs from an external drive?

I have a 13" MacBook Air (128); but I have tons of programs that I have purchased from the Mac App Store, especially large training video programs. Even though I don't have a shortage of drive space yet, I certainly could find myself in that position if I keep ALL my programs and data on the flash drive. I really don't need to keep all these on my main drive; but I would like to be able to run one when I need it. Is there any problem with moving the program from APPLICATIONS to an external drive and running it from there? Should I leave the support files & folders (preference & application support) on the flash drive?
THANKS.

Thanks for your help on this.
The MacBook Air is a joy; but the limited drive space is the only caveat. I really should have spent the extra money on the 256 gb flash drive; but at the time I was in the mood to go minimalist. Unfortunately that doesn't work well for me.
I have already moved all my music to iTunes Match and moved the backups to the external drive. I also keep most of my archive data on the 3 tb external drive. It's mostly those training video programs which are about a gig each that I want to move to the external drive ... ones I would not use that often ... so it's nice to know I can do that.
THANKS AGAIN.

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