No point in going to DBW if you're not going to take advantage of it and do a lot of extra calibration that will make the car way more driveable (not something doable with the stock ECU or DSMLink). If you're going to keep it at basically a 1:1 ratio (50% pedal = 50% throttle) then just stick with cable throttle and call it a day. Especially in a manual trans vehicle.

K.I.S.S.