Since suppression was added, would it be possible to add Ja2 1.13 style full auto and controlled machine gun sweeps? In Jagged Alliance 2 1.13, weapons could be fired fully automatically; you could add onto the length of a burst of gunfire, with each additional bullet costing a small number of AP. You could also perform a controlled sweep of fire by dragging the mouse after clicking, which would draw a path for the soldier to fire on. This let machine gunners suppress a group of enemies with one burst.
Combined with the addition of suppression, and the penalty for moving before firing a heavy weapon, a machine gunner could fill a dedicated support role, keeping enemies suppressed from a stationary position with long bursts of gunfire while the rest of the squad closes in on the target.