infinite Move Command

[rxnnxs]

I have a new idea for an old known problem:
when issued a patrol command the units stop to attack.
when doing a move command they move and shoot.

i often do many move commands on two areas to get what i want. (i wrote originally points, but this is not possible because another right click with shift switches the move command to patrol)

an option exists where you can change a move command into a patrol.
but you can not switch back.
would it be possible to implement that as a code:
if clicking onto a patrol command it is changed into an endless move command?

if this is hardcoded and not possible,
is it possible to convert a patrol command into
a move command (like the SHIFT+G command)
where the move position that is reached is not deleted but put to the last of the move-queue?