Clives big picture is very close to my opinion about how I see QCAD suits in my daily live!
To say it straight - just a couple specialist tools e.g. a staircase, architecture wall -tool (etc.) doesn't makes QCAD to a full Architectural (or what ever) program!
Do I would like to have a staircase etc. tool - yes, I like to have the choice to put it into my personal Tool-bar ...
Do I like to have it mixed up with the generic tools - no! In my opinion QCAD would drive in a wishy washy direction - neither Fish nor Flesh
To make it short - here are the main points what I like to see in the future of QCAD (and I have the feeling that I'm not alone with this opinion ... )
More plain generic tools - fine tuning on existing tools - just to make the daily routine task easy,
Possibility to set up a customized tool bar / menu for Industry specific tools (apps, plug-ins etc), Update save!,
Open to the world = export / import like sketch up etc., etc., etc.,
QCAD is already a really really good 2D CAD program but I also think there are still many possible improvements what could be done ...
... before QCAD has to walk on new trails ...