My comrade in the WAW Tournament brought something interesting about the Suppression feature.
If a Machinegun or enough firepower goes overhead, you begin to lose your cone of fire, streching alot as you're supposedly pinned down. But however the thing is you cannot simulate fear and suppression since players themselves do not have any fear whatsoever of dieing since its not like your not going to respawn.
Damn I forgot this was Suggestions, my bad.
There's already a discussion on that: http://gamingforums.com/showthread.php?t=265412