Quiet a good idea, but as I see myself (after getting hard in d3dx,cpp, bleble), every one of us finds its own way. But, the way to reach advanced !J devs is nice feature, though they might feel overhelmed with too basic stuff which is put into the board when someone drives himself a shortway.
Dev team now ( in my eyes ) have no time to sacrafice for docs, so I'd rather advise to stay as it is and leave extension questions for other media. Forum is a good place, though I've never had an answer for difficult questions that were cleared later, while individual investigation (which of course gives you more exp and approaches you to the core dev itself:)) I'll give you an example. I use to put my thoughts into gantry4/5 staff which is using totally active chat, just find them and ask ? There are people who ask how to apply this and that, without checking docs first. This is a risk:) They answer, but !J is something else than template devs, they make things their way, as you can, but the fundamental thing to do is to understand mvc standing behind !Joomla and apply skills. It only depends on you need an ext for yourself or you are looking to make all people happy with it:) I'd start from the first thing.