Your goal is to impress people at an audition right? You obviously do not have enough time to develop your single stroke roll technique so really, whatever you have to do to impress these people is what you should do.
Asking us if you think double strokes are cheating or not doesn't really matter. The people you are auditioning for are the only ones that do.
Now, if you want to go outside and beyond you focusing on your audition, then I'll ask one question:
What style of music are you getting into?
In some styles of metal (usually extreme grind) you will definitely be cast out for using double strokes of any kind. That style is all about the speed of single strokes. Those bands are really about how fast can their drummer play. Things they don't like to see are double stroke kicks/snares/rolls or any kind, and abosolutely no snare triggering. That will get you shunned in a heart beat.
I agree that the bottom line is you should only be worried about how good something sounds when it's done, as long as you can reproduce it live. But, you may still get some flack for using doubles, if you are using them when most other fast drummers still use singles (like 240bpm and below on the kicks). But really, you only get flak from the teenage fans, you won't see any from other drummers, especially the touring pro's. But unfortunately, it's the fans that support the band so their opinion seems to count sometimes...
