I'm aware of the ticket 3164 but I want to properly expand on it.
First - one thing that we need to get out of the way is "No I do not want ArmA2 movement and its issues back". There's one aspect with new movement that is however fundamentally wrong.
The problem goes much deeper than just too fast sprinting.
Inertia is completely absent from ArmA3 - thus
There is no noticeable transition between standing and sprinting.
There is no noticeable transition between sprinting and stopping.
You can turn 180 degrees while running full speed in 0.1 seconds. That's right - you can immediately run the other way like in some 2D platformer. Now try shooting a guy doing this trick.
This is one thing that ArmA2 flawed movement has over ArmA3's movement. Sprinting there had inertia and you couldn't instantly turn while running full speed. You also couldn't dodge bullets by simply hitting shift and pressing movement button - which is actually possible in ArmA3.