How easy is it to go into the mod folders and add a reaction fire to the shotgun again? The shotgun is a very good weapon for protecting yourself from Reapers and I feel like even if it and the carbine had those, you'd have reasons to use both. A Carbine is a good "I want to give a soldier a primary weapon and a lot of other things" weapon, it's lighter and fires more often at the cost of damage and range, while the shotgun is a good breacher and room-clearing primary weapon.
How easy is it to change the values, and is it only just 1x or 1.5x?