lol, I was just laying down strata on a terrain I'm creating (trying to recreate the imagery of Sedona, AZ) and the mouse slipped and blended 10 layers together at one of the edges. I instinctively hit ctrl-z and nothing happened! Glad to hear it'll come some day!
MAME Cab PC: i7 4770@3.4Ghz (passmark 9945), 12GB RAM, Win 8.1/64, GeForce GTX645 (passmark 1898); Shiny new laptop: i7 4800MQ@2.7Ghz (passmark 8586), 16GB RAM, Win 8.1/64, GeForce GTX870M (passmark 3598); Old laptop: i5@2.3Ghz, 8GB RAM, Win 7/64, Intel 3000 graphics