i dont play 1.6 i dont know
create a desktop shortcut. Right click -> properties -> target (put it at the end)
Probably you can create an autoexec.cfg to do so. What launch parameter do you want to set?
Also, you can check your keyboard; there's probably a key next to AltGr that is a file with the mouse pointer on it, that will work as the right click.
EDIT: You can also use Shift + F10
playin 1.6 in 20k19 really