I object to this thought. We should let tall full court shooters roam free - they are, after all, a thing of beauty!
In all seriousness, though...
I don't see using a disk to effectively increase your height as being an issue. However, you had best have a good grip in it as most FCS will send their disk with some power. Other solutiosn might be easier to pull off.
However, if you increase the perimeter, you would have to be careful about bumps in the protected feeder zone. I suspect that contact with the held Frisbee would still be considered a violation of G30 as it would violate the spirit of a protected zone.