Do it, go for it...enjoy it!
Don't let the nay-sayers give you grief about it, either.
The "only" grief you should get is if you are in competition and an elevated rest breaks the rules.
All the rest of it is experimentation, and pursuing what you enjoy.
Let the couch quarterbacks bask in the glow of their monitors and enjoy listening to their own complaints....
Those that have valid points--like Rob, perhaps--have some point about the geometry involved between hand/arrow and the claimed pure instinct with the body aiming and not the eyes...but a properly installed/modified elevation can in fact improve shootability of some bows with heavy arrows, as it increases the height of the arrow, in some cases forcing the archery to place less of an emphasis on the arrow's trajectory, and more emphasis on the relationship of form.
In other words, it'll make the bow shoot higher than what you're used to, which may help your "instinctive gap" or "form" or whatever term needs to be foolishly picked at here, if you have a heavy arrow with slower speeds.
See Ya,
Marc