I have a little different answer, but I agree with you on practicing from various positions. I shoot from my knees, and from a field chair to make sure the I have a comfort level doing it. As far as dropping the bow arm goes, it tend to throw a guys anchor point off a little, should likely change the sight picture and cause issues along those lines. There's only so much bending at the waist that a guy can do, but PRACTICE at various ranges and angles and positions is the KEY to REALLY being ready for what archery hunting has to throw at us.