Not yet, but this is an area we’d like to do more work on in the future. Right now, you can use ‘thanks’ as a measure of trustworthiness at the very least, but we know it’s not enough alone.
Notifications are also something we’d like to explore in the future. As you said, currently the assumption is that you’re actively editing when someone comes in and asks for help, and then you’ve got to remove them from the project when they’re done. We also want to improve this flow in the future as well.