Is there an easy way to sign up for notifications on new issues in certain categories? I'm happy to sign up and be responsive for areas that I'm familiar with, but I don't really have time to just keep up with the whole thing.
Also, If we wanted to allow something like that we'd likely need much finer categories. Right now there's only "board support"... we'd probably need a separate category for every architecture, SoC and board so that people could really sign up for their specific areas of expertise.
An easier alternative might be to add some more names to the MAINTAINERS file and then tell people to find and CC the right people from there whenever they file a bug.