tldr: as soon as we figure out a good UX. Is there something you’re building that would benefit from this? What do you need it to do?
I think customized service tokens in Machines could get pretty complicated. We’ve had a hard time coming up with ideas for what people could build if they had these.
However, I think it might make sense to let you create your own custom Macaroon we could use to generate the service token. So maybe it’s the same problem.