Well, if the wife wants only 1 dish, you might have to get rid of FTA setup.
Your sub box is just not going to like losing signal and changing sats all the time on your motorized setup for fta.
Not to mention how much of a PITA it will be for her to change the dish back to one sat, go to dish sub box, watch tv, change the channel, then have to go back to FTA box to move the sat again.