I had a thread like this a few weeks ago and basically the conclusion was "We aren't gonna change the game, so stop asking"
Rather stupid, I think. Of course the support class is suppose to be a suppressive role, by laying down massive amounts of fire. In real life, people stay down when a M249 is firing their way. However, in a VG, they pop up anyway because it's not their real life on the line, and take a few hits and headshot the MG gunner.