-Ability to have projectiles pierce cover based on their penetration values, to strike targets on the other side (I.e., the shield of a ZiS-3 deflects 9 mm rounds, but an AP 7.92 mm will punch straight through and rip Evgenyy's face off).
In the meantime, buff M2s and DShKs!
...if they buff PTRSes any more, the forums will probably shatter with rage.