I guess you have answered your own question: No. This will probably get done in the near future, but it might be helpful to post an idea for this.
Most JS Action are short, and so it will not add much value to minify it.
It would make sense when JS action are using other libs, that might be bigger
When Mendix will support bundling dependencies it would much sense. If you are already copy pasting libs in JS action, it would be wise that the JS Action developer does do this. .