Err... Sorta... There are several problems though I haven't seen the guns targeting separate targets but i wouldn't count on that.
First... There is a flag to make all the guns shoot in sort of salvoes using separate firingpoints... They fire independently in salvos so it will not appear like the turret would fire for example three shot simulatanously.
Second... Guns are not in any way locked to a specific firing points so firepoint from which the gun shoots will alternate making it look very odd.
So best bet for salvo fire is still the good old classic '$swarm:' with ridiculously short 'swarmwait' times. And unless you are aiming for DEM or JAD level of realism do not stick different weapons into a single turret.