I like your suggestion #2, Gnat. "b. slow down sprinting slightly and bring weapon to "hip" status while sprinting. (this seems most realistic to me, because: its about impossible to full on sprint without tossing your arms back and forth and to think you could hold a gun on your shoulder while sprinting as fast as u can is ludicrous.)"
I hope, hope, hope the full sprint speed is decreased to realistic levels. Here is a comment I made quite a long time ago on another thread, it bears repeating here, particularly with 2.87 nearing completion: "Warp-speed running. The other night I was leaning from behind the box at the tunnel side of the big bridge on the Chasm map, had my M16 on semiauto. Enemy soldier comes out from behind a box at the FAR END of the bridge, runs toward me. I squeezed off 3 rounds, unfortunately missing with one or two, only winging him, and before I could get another round fired, he was literally on top of me, firing his automatic weapon point blank. I lost that fight. That bridge must be about 50 yards long, and he covered the distance in about 3 seconds. Many other instances, such as throwing a grenade at someone who is 50 or more yards away, and having him get to me so quickly he not only outruns the grenade blast, but kills me at point blank before I can even get my weapon back in my hands. That's just too darned fast. You should not be helpless against an enemy 50 yards away just because you have a grenade in your hand and he can beat the change-back-to-weapon animation by sprinting right at you. (If I've estimated the times and distances incorrectly, it's probably out of frustration...the problem remains the same.)