Ok, if I was going to take a wild guess on what this thing would be. I would say that it would have an intake just like a conventional 2 stroke and just an exhaust valve. The biggest problem that a 2 stroke has on meeting emissions is not the oil in the gas, but he huge amounts of unburnt/partial burnt gasses that are dumped out into the exhaust. If stihl can controll when the exhaust will open, they could reduce emissions. I would still fire on every stroke, just now it would have a valve. (maybe a rotery valve so rpm would not be that much of a problem)
Actually you could have a pressure oil fed bottom end and not even have the fuel go through there as long as you had a pump to pressurize the mixture and force it into the cylinder. Supercharger anyone???
just my two cents.