I know that you've said that the new QCAD is coming soon. Hopefully very soon! I hope that you have taken a look at how ACAD handles printing. I'm not suggesting that you infringe on any copyrights, but having a "paper space" that you can easily add title blocks to is very useful for real-world production use. ACAD uses configurable viewports (there can be one or more) in the paper space that act as a window into the "model space" drawing. These viewports can have independent scales and active/hidden layers. It would also be very useful to have standard architectural paper sizes (or paper sizes in inches) and native .dwg (at least 2004) support.
If you want to really grab some CAD market share, especially in the Mac & Linux markets, the items listed above would definitely be a move in the right direction. I look forward to hearing from you soon!