Disabling the Spindrift Sleeved Sail on the Water

I've had a few situations now where I'm in unsteady waters and want to be able to switch my Spindrift 11N to rowing. I've added a topping lift (a simple single line from the top of the mast to the end of the boom) so that the boom doesn't drop into the boat when a release the halyard, but that's proving to be annoying still, since the lift is hard to adjust when there's a breeze and the boom is bouncing around. So now I'm thinking about adding a block to the top of the mast and running the toppi

Is there a way to put in a second reef in the spindrift sail? I guess not really since it would interfere with the zipper? How would one go about designing a “storm sail” or “super low power” sail for the Spindrift? Has somebody already done so? Went out in rather stiff and gusty conditions yesterday, mostly just a close haul upwind, and then a tack, and a beam reach back to the dock. It was fun, and scary, and made me wish I had less sail power. The boat even capsized af