Currently you either minify, or you don't, there is no middle ground or customization available.
In my case I'd like to not minify, but to simply avoid outputting comments as they are simply unnecessary and take quite the space (think about giant license headers).
This should be doable with a minification configuration like (edit: just tried, and I can't come up with a config that works!):
{
compress: false,
mangle: false,
format: {
comments: false
}
}
Possible CLI option: --no-comments