Multiple non-conflicting mods

[Marshall]

I only need the most basic functionality:
Audio Bag writing: Ability to add or replace a wav file (audio.bag/idx already exists)
Mix writing: Ability to add or replace any file (mix file may not already exist)
CSF writing: Ability to add or replace a string

If there are a large number of files/strings to add then not sure what you can do in the way of writing everything in one go rather than inserting one item at a time and resaving. The former might be quicker if it's possible.