It's not so much ME's ammo system as ME and ME2's combined--weapons "cool down" in the form of regenerating ammo counts but you can still eject clips to get a full score back. From what I read, it's a matter of a few .ini edits. Shouldn't be too terribly bad, god knows I've done enough of those on Morrowind and Fallout 3, but then again, this is Bioware, not Bethesda.
Glad to hear it. I was also planning on exploring re-enabling the old ammo system they made before switching to the tradition heat sink clips but, even if it did unbalance weapons, but wasn't sure if it'd corrupt my game or break it.