I would actually pay for full Commando/Swat rebalance, making a difference between Ar's and Smg's, fixing Thompson and adding AR15 for Swat. I know that TWI would never do that, but I vote for all OP's options because I don't mind to keep investing in the game, but new weapons is just... eh.
If you trying to sell weapon on gimmick, not P2W, it needs to be a really good one.
Revolver is made for people who still wanna play gunslinger but has problems with accuracy.
Scuffed lightsaber looks like somesing that comes from MMOFPS like Counter Strike Online: fire damage, "charge super attack with kills". And I don't really mind that, but if you wanna go that route might as well go for F2P, and while at it make actual lightsaber. Yes, I know, copyright and stuff, but CSO somehow pull that off, why can't you?
Also agree with
liamtranzig about shop being unappealing to players. No discounts, not even regional prices. Weapons from first KF was sold through Steam, and I was much better.
Same with costumes/characters - there is not much of them to have a choice. People keep asking for classic or realistic military outfits, same with characters.
I like Mrs. Foster but I can't be bothered with Santa. He is seasonal character, using him outside christmas is just feels wrong, it's still unclear if it's the same guy from first KF, because using him outide christmas was atleast understandable.