Ken, Bob,
the anchor roller assembly is well bolted into the stem and hasn't shown any issues in 13 years... If you were further extended ahead of the bow, like with a longer sprit you'd have more leverage on the roller and might need something like a bobstay to carry the load but I don't think it's needed with just the roller. FYI, I fly a waay oversize Assym chute (1300 sq ft vs the more common 800-900 sq ft cruising chute)and have flown it in up to 25kts without any issues.
As to Ben's other question, I've never been convinced that the ATN tacker does much to improve performance. My guy is led aft on the port rail for control from the cockpit. going downwind, easing the guy lets the sail fly forward and to windward to better capture clear air. reaching, tightening the guy flattens the luff for better on the wind performance. I also have a mylar/pentex code zero that can sail well in light air on a close reach with the luff tight. I've never had a problem jibing either sail.