A friend of mine has been working as one of the core developers of an open source platform for many years. He has been using Stackoverflow.com regularly, but never asked or answered any questions. Therefore he doesn't have any reputation points.
Nevertheless he'd like to signal that he's available to answer questions to users, but won't be looking for new questions by himself. Is there a better way than just subscribing to tags to say: "I'm an expert on this technology, and if you have questions - please ask me."? Maybe there are ways I don't know about to achieve that goal through existing functionality.
Edit: Maybe I should have phrased the question differently. I was looking for a mechanism to signal to users of a technology that there's true expertise available at Stackoverflow.com. The open source project I meant is OpenLaszlo, and I've encouraged the community members to ask questions on Stackoverflow.com - instead of the OpenLaszlo.org forums or mailing lists.
If you compare the number of questions asked on Stackoverflow.com compared to the activity on the OpenLaszlo website and mailing lists in the past years, Stackoverflow didn't play any role for the community. We have 40 questions tagged [openlaszlo] here, and tens of thousands of messages in the OpenLaszlo.org mailing lists and forums.
If you know the key developer who have been working on the OpenLaszlo compiler, and know that they have Stackoverflow accounts, isn't there a way to ask those people directly - similar to what you'd do in the developer mailing lists?