That would be nice, but..
1 - the Il2 game engine cannot handle all those 3D trails (sadly!)
2 - it would'nt be all too historical, since not all guns displayed such spiral trails. 
@Hguderian: check your PM's 
acytually i disagree wth both points:
1 - i have made it wrk for every smoking gun, wth some issues but it does wrk, except the sprite that it spawns is wrong, so it looks weird (spawns different smoke sprite instead of teh new one included in mod), and i have no lag as i shortened the trail duration as well as lowered some other effects to not loose any fps when i have like 20 flak gunners from teh ground
2 - i have seen guncams and i will have to say that almost any large caliber weapon has such trails (not counting anything like mgs, but i disabled smoke trails on every weapon that is smaller then 20mm) as a .50cal may have trails but it makes it hard to tell if i gettin shot by mgs or cannons. anyway a mk108 may not have exact same effect but it just looks ugly with old effects, especially since mk108 = freaking massive
so i'd love if someone had suggestions on fixing it spawning incorrect sprite,
and also if anyone wants this for any weapon an if i get permission from author i can release the mod