Great job Boardboy!
If the lift exit ramp is any steeper than almost flat, the number one thing is to get as much weight on the front foot as possible. I have my beginners practice this during their straight runs so that they are ready for the lift. Whether the back foot should be placed all the way on the board or not is a matter of debate. At my resort, the lift exit ramp is steeper than it should be. My experience has been that having the back foor half on and half off (butted up against the back binding) works best. When getting off, the students ride a flat board to the bottom of the ramp then tilt the board to engage whichever part of the foot is hanging over and they come to a nice stop. I also tell my bigger students to hold on to the back of the chair before they turn to line the board up straight. Little heads should hold on to the front edge of the chair after they stand up. They should hold on to the chair long enough to let it push them.
To help learn how to get their weight forward, I have my students practice bending their front leg and wiggling their knee from side to side, then holding it in a forward position. The next part of practicing for the lift is to do straight runs at the bottom of the trail. Line yourself so that board is pointed straight down the hill, give yourself a push step, step your back foot onto the board, set your front knee wiggled forward, ride the board flat and straight for 10 feet, then do a toe or heel side turn to a stop. If you can do these things at the bottom of the hill, you can do them getting off the lift.
Sometimes we forget how scary exiting the lift can be for a rider. To help my new instructors remember what the first day feeling is like I sometimes have them get off the lift riding switch (free foot in front). Whether you can do it without falling or not is not important. The last 5 feet to the lift ramp, where you're thinking "Oh $#$#, this is NOT going to work" is what the experience is all about.
Skidiver, if your wife is falling backwards when she gets off the lift, it's because she is not staying with the board after she stands up. The sequence is board down on snow, stand up, board starts moving, upper body does not move, weight gets back, board moves faster, weight goes back further, board moves faster, crash. Concentrating on getting all the weight on the front foot forces the upper body to move with the board. The sequence now becomes board down on snow, stand up, step onto the front foot, let chair push, ride off the ramp.