I work with lots of 2"x3" and 2"x4" 11 gauge rectangular tubing. So far I've been making my tubes by sketching out the outer profile with the "2-point rectangle" tool, then using offet to come up with the inner profile before extruding it to the length I need. When I occasionally work with square tubing, I get to use the "Pipe" tool instead, which is always a treat.
Sure would be nice to be able to create non-square rectangular tubing with the "Pipe" command.