Old thread, I know, but - if the conclusion is that the pitlock isn't enough for horizontal dropouts, is there any fix that would correct this? e.g. could a chain-tensioner (i.e. that just keeps the wheel in place), so that a bolt providing a lesser amount of torque could be used to keep it in place?

In addition to wanting to use a pitlock, I don't want to carry arround a a 2-foot wrench in case of a puncture.