I haven't made any cab doors in a couple 3 yrs but square cut stile and rail are easily done on the TS using a standard miter gauge with some simple home made mods. For end cuts on profiled stiles and rails on the RT, I used a squared and butted piece of 6"X6" 6/4 sugar pine as a backstop I was happy with the results.
I bought and tried using one of those material grabbing miter gauges (pic'd below) shortly after building the RT back in the late 90s. I was never satisfied with the results, if there was any hook or cup at all in the mat and it was face down the handle would rise up out of the track.
If you're going to be building lots of doors over an extended time frame and the work is going to pay for the tool do it, however if not, with a simple block of wood I feel like I have adequate control and quality over the material and cut.
Never bite the hand that looks dirty!
The more you know the more you're worth