Revise default behavior of accepting an sb method with a changed signature

[LinqLover]

ATM, the default accept command will delete the old method and install the new one. Alternatively, one can press cmd + shift + s to save only the new method. Especially when working in CodeHolders, this is still confusing me frequently because the semantics are contrary to the CodeHolder semantics. I would like a solution that:

• makes the copy icon which "reminds" you that you can/should use shift + s to save a copy toggleable, so that I can also toggle this icon in the moment I change the signature and upon save, the current toggle state will be used to determine whether the old method should be deleted
• provides a preference for the default state of this icon

Maybe we could also talk about spawning the new/old method in a separate window when a copy has been saved. :-)

Maybe I will implement this myself when I have lost enough methods. :-)