I've been trying to heave-to in my Daysailer -- start a tack, but leave the jib sheeted all the way in on the wrong side, sheet in the main hard, and set the tiller pretty far to weather with the tiller tamer.
I've managed the trick exactly once, with the boat sitting just nicely and peacefully in the middle of the lake while the strong wind blustered by and I ate half a sandwich.
But the one time I did manage it, I felt like the boat was very finely balanced on the rudder. If it wasn't juuuuust right, or if I bumped anything, the boat would fall off the wind and start sailing. (With a fully sheeted-in, cleated main, "sailing" means "better uncleat that PDQ or you're going over.")
Has anybody else had better luck? What is your technique?