dedoporno: You can move with the mouse but it's quite terrible as you have to keep the button pressed and your character follows the mouse cursor. The movement and the cursor tracking are really janky and it's hard to move and do other things quickly and reliably at the same time. Personal opinion, of course. You can try it for yourself.
Pretty much all map interactions are done through the keyboard (obviously you'll be doing most if not all tasks and the sabs with the mouse because of their nature) so you already have that. My mouse extra buttons are actually bound to keyboard keys - for sabotages map, for opening and closing tasks/objects and for reporting.
Yeah, you can move with mouse, but only if you have controls on mouse only right?
If you have them as mouse+keyboard you can't move like that. At least I couldn't.
I would like to use mouse for movement and keys for kill, reporting and such but it doesn't seem to be possible.
It may be superior option to move on keyboard, I don't deny that, But I find it more casual this way.