Good point, Laszlo, but that adds another degree of freedom to the tiller confusion issue. It's difficult enough to learn instictually "tiller towards trouble" without the push/pull factor. This may be a good solution for seasoned sailors, but not on anything that might be considered a training boat.
I've got to respectfully disagree. The Skerry is just as much a training boat as the Passagemaker. In my experience, sailors who start with p-p tillers are fine with them, sailors who start with swinginging tillers are fine with those. It's only when you have folks who are used to one and trying to convert to the other that problems occur. Muscle memory gets in the way.
A p-p tiller is basically a hiking stick with the yoke being the actual tiller. If someone has be working through a mnemonic, they can think of it like that and the mnemonic still works.
But 1/2 hour of practice for several days in a row will do away with the need for mnemonics for either tiller style.
Laszlo