Thank you for your post.
I have not found a way. I tried setting a startup script to insert a file from a network drive, but when I go to Insert -> File, it defaults to the original directory setting.
Has anybody found a way to set a default drive for "Insert -> File?
For the time being, I have a message box telling users how to not use their mapped drives. It's not ideal by any stretch and we'll have to see how much of an issue that causes down the line. If anybody else has any suggestions, I'm all ears.