1. Slope presets. It would be nice to be able to just say all piping has an 1/8" slope and then draw the piping and the horizontal pipe is already sloped for you. You would be able to adjust the slope at any time, but the preset slope helps.
2. single sided support modeling. Have seen this in many installations were a single support is used on a stanchion on a vertical line. Imagine a vertical pipe, but with only a support on the North side of it, holding the load of the vertical line.
3. Custom output report tables in excel format. Mainly for support and anchor reactions. Displacement is nice on occasion, but mainly concerned with the supports and anchors and pulling the operating, maximum, and occasional reactions.