I also enjoy shooting off the top of my knuckle, but some type of arrow indicator is nice to have. Hand placement just isn't enough for me, so the last bow I made that shoots off the knuckle I incorporated an indicator into the top of my leather grip. I took the top 1/4" or so of the leather and rolled it under, then tied the leather wrap in place around my handle. This left a nice fold at the top of the leather wrap that the arrow sits nicely on. What I like about it the most is there is zero contact with any part of anything except the side of the bow itself. I think this allows for a much cleaner release and arrow flight. Maybe that's why this little bend in the handle flatbow is so dang accurate? No shelf or anything to deflect my arrow upon release? I dunno, all I do know is that I really like it. One last thing, I stuck a cloth or actually flexible fabric band aid on the side of the bow where the arrow sits just above the leather wrap so it wouldn't make noise when I draw. I could hear the arrow sliding along the side of the bow as I drew and it irritated me. The fabric band aid quieted the arrow draw instantly.
BTW- What ever happened to the Ferret? He wasn't around when I joined back in Aug. 2010, but I've heard alot about him.