It is very easy to add more CW 2.0 weapons to the gamemode, all you'll need to do is make sure your weapon is running a specific weapon and then call several functions in sh_loadout.lua
For example:

local l115 = {}
l115.weaponClass = "cw_l115"
l115.weight = 6.5
l115.penetration = 30

self:registerPrimaryWeapon(l115)

local deagle = {}
deagle.weaponClass = "cw_deagle"
deagle.weight = 1.998
deagle.penetration = 17

self:registerSecondaryWeapon(deagle)