It would be a good idea to give the players some more customization options, like the placement of the various "decals" and for the pauldrons, i play as a Salamander, the almighty sons of Vulkan, and i have the full Deathwatch armor, but to be lore correct, the Chapter Symbol or Crest, must be placend on the right paludron, for now there is only the company symbol, and not only that even a lore accurate customization of the helements for the ranks too, Salamanders colors are different from the Ultramarines colors, even if there is the Codex Astartes, traditions must be preserved and followed.
There could be more lore accurated things like other weapons, flamethrowers for example, but for now some customization could be an Emperor Blessing.
The game is still a masterpiece.