I have seen the specs on the 7D, and am curious about wireless flash control. I have a 40D, 580EXII and 430EX flashes. I occasionally use the 580 as master to fire the 430 as slave in 2-flash setups. For reasons of weight, versatility having both flashes off camera, rotating the camera to portrait and not having the flash to the side, I was considering getting the wireless flash transmitter ST-E2. Does the 7D incorporate that functionality, with the ability to set up flash groups and ratios? That would make it even more attractive to me.