Personally speaking, hashtags may be one of the worst things that ever happened to the Internet. I would be shocked if 1 out of 200 people know how to use them properly/constructively. That said, we have some pretty significant tagging improvements planned. Hashtags, if I can help it, will certainly not be a part of it.
I'm confused - what did you have in mind? You said you'd like a place to ask development questions - so I dedicated that forum to that purpose. I'm sure our devs are willing to help, time permitting. What else were you looking for?
Most have been using the "web design and coding" forum... I have repurposed that and removed the rule verbiage that discouraged IPS-specific topics. This was a holdover from our earlier years. You may now use the Design and Development Assistance forum as you wish.