Great tool you've created - thank you!

Unless I'm being dim, I don't think there's an easy way to do this already (?)

My thinking here was that I'd like a way to watch activity on just the items I had started. Thus it would be narrowed down but at the same time targeted to repos I'm interested in.

But in theory some people might want to watch activity of the repos a designated other person had starred, so accepting a star username would seem a handy way to do it.

Effectively it would look at the items on here:
https://github.com/username?tab=stars