Constantly balancing and rebalancing weapons is delaying other features; adding passenger missions delayed other features; adding CQC delayed other features.
If it improves the game then fine, and a lot of the features that are most needed don't rely on the kind of expertise that would be required to modify the game rules for a specific server, unless FD's team is so poorly built that they have a load of people who all do the same job rather than hiring sub-teams of specialists.
Thast's exactly the point. If you split the game in two different sets of mechanics, you esentally have to ballance every existing and new feature for each of them. Split the game in two and everything will take longer.
By all means add a a public mode where player killing isn't allowed, but don't split the game in two.