Fixing Auto Fire

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Any suggestions on Fixing Burst/Auto fire for D20 Modern/Future and any other 3.5 D20 based games that use guns?

The -4 to hit, +2 damage rule for Burst, and -2 to hit, +1 damage for Double Tap is stupid.
I saw a few threads for Auto Fire, and the one that kind of makes the most sense is making the Reflex Save to avoid the damage equal to the attack roll, and you get bonuses for cover, armor, etc.

However, burst/double-tap would make more sense if you rolled that many dice and got -2 per dice. Less control, but spraying the target area. 3 round burst with a rifle? 3 attacks at -4 each. Double tap? 2 attacks at -2 each. 5 round burst with a LMG? 5 attacks at -8 each.

But law of diminishing returns would make it almost impossible to hit things once you get up to auto fire with 10 shots at -18 each, though you're almost guaranteed to roll a Nat 20, which is an automatic hit. Thus the saturation/area of effect rule instead.

Any thoughts?

This is something that's really been bothering me.