What if you only had to press L and AutoCAD would automatically fire up the line command?
I had to work with a program that did that. A piece of crap called RADAN
I had to use ot for 2 years and it was the worst piece of software ever written, up there with Lotus Notes, Siebel & JDE
L for line, P for Point, E for endpoint etc etc
You could use the mouse for input or you could use the keyboard for input, but you couldn't switch between the two in mid command. It was either or, nothing else.