I can't get the machine-gun playstyle to sim anywhere close to traditional "as-designed" Frost DK.
FrostT19P default profile: 258.4k DPS
FrostT19P default actionlist, talents from IV: 248.3k DPS
FrostT19P machine-gun actionlist, talents from IV: 245.8k DPS
This is using the latest SC snapshot as of Sept 26. For my APL, I added the following lines below actions.bos+=/howling_blast,if=buff.rime.react and removed the rest of the APL, as it does not apply to machine-gun style.
Code:
actions.generic+=howling_blast,target_if=!dot.frost_fever.ticking
actions.generic+=/frost_strike,if=runic_power>=80
actions.generic+=/glacial_advance
actions.generic+=/remorseless_winter
actions.generic+=/frostscythe,if=talent.frozen_pulse.enabled
actions.generic+=/frost_strike
That priority doesn't win on multiple targets, either. The talent choices do of course as they're all AE.
FrostT19P 3 targets, default profile: 351.7k DPS
FrostT19P 3 targets, default actionlist, talents from IV: 412.4k DPS
FrostT19P 3 targets, machine-gun actionlist, talents from IV: 405.8k DPS
It is of course possible that Simcraft doesn't model something correctly, or I may have missed something in my APL. But my guess is that IV guide was written for people in cutting-edge raiding with a ton of mastery, which explains why Frostscythe might be worth using without Killing Machine
or multiple targets. The simcraft gear profile is average itemlvl 844.