Not one of the best suggestions, but it may be helpful to some who have many loadouts and want to mark them without hassle.
Pretty much you can mark a group of loadouts as a set, and choose when to mark them as PvP or not.

This would allow people to efficiently toggle between T1, T2, and T3 LD loadouts instead of clicking them one at a time. (Wait... T1 is nearly extinct.)

I don't really see much downside to this as it wouldn't affect much of the gameplay but would allow more efficiency.