Only smartlinks-and-lasers and smartlinks-and-tracers are mutually exclusive, so combining a laser sight and tracer rounds in a fully automatic weapon yields +2 dice for short bursts, +3 for long bursts and +4 dice in total for FA bursts.
Firing akimbo negates modifiers from laser sights and smartlinks, but not tracers. For two gun shooting, tracers are the only thing of the three which can raise your DP. However, as Max pointed out, you can't do akimbo full bursts, so you'd need to stick with long bursts. HV will let you do two long bursts in a pass though, so with enough cyber or magical RC, dual supermachs stacked with tracers and stick-n-shock will power through crowds. Meanwhile, +2 dice each to two guns is still the equivalent of +4 dice.