Anything you want koala for can probably be done in the terminal.
This is probably the better way to do things anyway, because a terminal/shell is GUARANTEED to exist on all UNIX-like systems. It doesn’t matter if it’s Gentoo or Mac, you’ll have access to a terminal. That means, if you store your meaningful scripts as gists on Github, you’ll always have access to them and can do whatever you need to do. This is useful in a remote server situaion, which you UNDOUBTEDLY will run into at some point. Or, if you just have multiple devices. It’s really just a good idea to use the terminal as much as possible. That’s my opinion anyway.
I’d advise against becoming dependent on Koala or any one piece of software for that matter.