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On the full auto or burst accuracy, remember power armour actively assists with that.

 Gert wrote:
Astartes Chapter Terminators use Storm Bolters, the more advanced (although it's never said why) version of the Twin-linked or Combi-Bolter.

Over the course of the Horus Heresy the Combi-Bolter emerged as the most dependable and tactically flexible weapon. It was subsequently fitted with better ammo hoppers and it's rate of fire was increased to create the storm bolter used by Imperial terminator squads. Traitor Terminator squads are still equipped with a variety of older combi-weapons because they are more useful in the close assault roles they favor in battle.

Codex: Chaos 2nd edition, page 73

I guess CSM get by with less ROF because they're just better shots. They've been doing it longer, of course.

 Gert wrote:
Flip a switch to make it single fire, burst fire or full auto. Same with Lasguns and Autoguns.

This. Pretty sure I've read multiple BL novels where marines are described as flipping switches to change their rate of fire. Full auto seems to be a pretty niche fire mode because it wastes ammo compared to a marine firing single shots or bursts.

Head canon: Admech dogma prevents them from removing the full auto option on bolters used by unmodified humans. This absolutely means that a human who dares to try firing full auto inevitably ends up dropping his gun or hurting himself. Some humans flip the switch to full auto accidentally and are convinced their bolter's machine spirit is extremely blood thirsty and wild.

 Gadzilla666 wrote:

Spoiler:

 Gert wrote:
Astartes Chapter Terminators use Storm Bolters, the more advanced (although it's never said why) version of the Twin-linked or Combi-Bolter.

Over the course of the Horus Heresy the Combi-Bolter emerged as the most dependable and tactically flexible weapon. It was subsequently fitted with better ammo hoppers and it's rate of fire was increased to create the storm bolter used by Imperial terminator squads. Traitor Terminator squads are still equipped with a variety of older combi-weapons because they are more useful in the close assault roles they favor in battle.

Codex: Chaos 2nd edition, page 73

I guess CSM get by with less ROF because they're just better shots. They've been doing it longer, of course.

I mean, that'd depend on the CSM in question and how the Warp has frakked with his personal timeline...