Jarvie, this is a preprosal, not the official proposal. The purpose of a pre-proposal is to get a rough the idea out. Its just my opinion, but I think editing a preproposal is fair. SPL has edited their own preproposals too in the past.
Remember that that the only vote that matters is the proposal itself which is unalterable.
But adding in a provision of how it will be implemented doesn't impact the gist of your proposal at all.
Of course this is my opinion, you and others may certainly disagree.
He answered in the live qa on the day of 1.5 saying that my proposal would be very easy. I assume turning it all off is even easier. But could be good to ask.
ok... I edited my reply after thinking about your point regarding editing. See @joshman's reply, I think he sums up exactly how I've seen it done. Spl even edited their own proposal in the past when they had community feedback.