+1 on Swift scripting. There's lots of developers interested in using Swift for scripting as well, there's nothing selfish about it. Unfortunately the scripting support in Swift is practically not given (there's no file import or script-dependency definition, for example), but related pitches do exist.
I think it would make a lot of sense for Swift Scripting to be part of a Swift Tooling workgroup as scripting mostly benefits from great tooling and scripts can be seen as tools themselves, given that they are typically run from the command line.