Actually draw length is measured from the bow at full draw, from the throat of the nock to the deepest part of the grip + 1 3/4". It has nothing to do with the location of the rest whatsoever.

That being said I use arrows about the same length as my draw length, not because I'm afraid of cutting my hand, but because they just happen to spine right for my setup. But then I have never been uncomfortable drawing a short arrow so long as it does not draw past the rest. I keep my draw length to my optimized length and the bow weight to where I can control it.