I don't have a support account, but I've been on two of the recent NextGen webinars that have open to the public. I think they are a great way for them to showcase upcoming features and field questions regarding those features.
I think the Slack channel does a better job of addressing how-to type questions, as the solutions are often a group effort. Sometimes Nick Rupley will even jump in and answer some of the Slack questions, which tends to work better than the webinar since he can ask questions back to the original requester other than guess at what they may have meant if the original question wasn't clear.
I haven't looked at the mirth wiki (
http://www.mirthcorp.com/community/wiki/display/mirth/Home) in a long time, but maybe the MCUG could encourage adding/updating some of the how-tos on the wiki. Maybe even work on a curated list of helpful examples from the forums. There are some really well written examples (as well as some poor examples,) and we could make it easier to find the good ones.
There is also
https://github.com/nextgenhealthcare/connect-examples which is maintained by NextGen, but accepts pull requests from the community. I've had the only public submission so far. Nick merged it pretty quickly. They were also responsive when I pointed out the original project was missing license information, and I'm happy with the way they decided to handle it.