I was thinking more of removing them completely.
Start with two copies.
In one copy remove all the multiplayer parts. (anything not needed for single-player)
In the other copy remove all the single-player specific parts.
(anything not needed for multi-player)
Resulting in two brand new engines.
Both being trimmed to their own specific needs.
I just think that both would be easier to read if they were separate.
Bullshock is right.
There are two separate engines there.
They create separate and very different types of games.
Why should we edit both every time we make a change to one?
If the change applies to both, then we could edit them both.
They should be separate.
Then we could have two or more development teams, with each team working on a separate engine.
Sharing all new ideas of course with each other, but working independantly.
Each team's workload would be cut in half as they could ignore the other aspects.
Both modifications could be developed faster.
And since they were developed as separate engines, the teams' work can't clash.
Both engines are compatible with the editor.
Whatever you can imagine, you can animate. --- Walt Disney
All too easy. --- Darth Vader
Just do it! --- Nike