If there was an adjustment, then it shoud be to Strength rather than Recoil - Firing from the prone doesn't have that great an effect...
Thinking about it, I'd be inclined to leave Str and recoil alone and simply give a small bonus to the range. Prone allows for a more accurate shot, not necessarily more of them.
Kneeling I would leave the same as standing, however sitting and using one knee to help support the weapon might have a similar (but not as great) effect as firing from the prone.
Squatting might even attract a penalty as it can be quite unstable with webbing, etc throwing off your natural balance. It is however the prefered position when in a swamp, rice paddy, etc and is certainly quicker to adopt than sitting or prone.
Firing from a rest, for example from within a pit with the weapon resting on the edge, would probably result in a similar effect as from the prone.
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