The MX700 will allow a macro on basically any button - for example, I have almost every device button on the main screen set to run macros (they select the correct input on the 990, make sure the TV's on the correct input, and set the TV's aspect ratio).

You could easily set up a macro identical to MeanGene's (assigned to the "M1" button on the Model 950's own SL-9000 remote if you are still using it) to be a toggle for projector on/off.