I don't know if this issue has been addressed. But since I started out as a production draftsman I am always looking to improve productivity. I think using the mouse buttons
more would be more productive. You should never have to take your hand off the mouse. Your left hand should be on the left side of the keyboard with all the shortcuts defined with the left side letters. such as (cc-copy), (x-undo). I would like to see the right button repeat the previous command when out of a command mode. However, in a command such as an edit command, I would like to see the right command close the command or close the edit such as finish the line in a roof. I think also that being able to click the left mouse button to signify inches and the right to signify feet would help avoid having to find either the parentheses or having to type 0 space (a number). For example, when you click on a dimension to edit it. Say you enter 3, if you click on the left button it becomes 3 inches, the right mouse button becomes 3 feet. Make it quick and easy.