"If in doubt leave it out."
I haven't a clue about tiller extension length. And I'm pretty sure nobody else does either since nobody has used one in racing. Not legal. For this very reason I propose we make the rule effective immediately on a temporary basis. Then various people will try it and we'll know how it works. Then the vote could be to make it an official rule at the Nationals in 2012. A lot of people will have a lot more experience by then.
I am for it simply because I believe it will help equalize a parameter that is now unequal. We really don't know what the actual benefits will be, if any, until we try it.
I agree that a test phase would be wise. In fact, it would be nice to try it during Bay Week which is only a week from now.