Hi Michael,
Is an automatic boolean union possible with 'extrude'?
For instance, I might want to change the length of a framing member ( or a bunch of them) in a house design. Now I use extrude face to do that and then have to run the boolean union to make one piece. It is just a couple of clicks but it does take extra time ... particularly when there are a lot of pieces involved at one time.
cheers,
eric