Hello,
I would love to see a custom save folder info in the mod, because I have 2 minecraft profile setup (its a custom one, one for Appdata/.minecraft and one with Appdata/.minecraftsk/.minecraft and I think it would be nice to have bobby in just one folder and use it with my other launcher too, which as far as I know not possible now.

Please, can you add an option to use a custom save folder / location? I think its not a good option to just copy and paste and have the same files in both folders.

There is this thing called a "symbolic link" that exists in the Linux/macOS world that's just perfect for what you want (in fact, I'm extensively using it myself to share various folders across different MC instances as well). It effectively lets you replace one of the two folders with a link pointing at the other folder, thereby having the same files appear in two locations, pretty much completely transparently to any applications using them.

Seems like Microsoft however dropped the ball on that and not only are the default "links" Windows creates anything but transparent, the ways to create a proper one are also anything but user-friendly: https://superuser.com/questions/1020821/how-can-i-create-a-symbolic-link-on-windows-10
If you want to avoid the command line and are fine with installing another program, I suppose this one is decently simple.