I've been using QCad Pro for a few months now and I have to say that I love this simple program for field work!
I totally love the "keep it simple" approach for my preliminary work.
With that in mind...here is my wish list.
I hope it's worth some thought.
1. .PNG Export as well. - For further compatibility with graphics programs.
2. Using "SHIFT" and/or "CTRL" keys to snap at 15 degree angles while drawing. ie: using shift while drawing a line will allow you to visually snap to desired angle in 15 degree increments. Sort of like "ORTHO on Steroids"
Linux's Kolourpaint uses this already and it's awesome!
3. The ability to place user specified amount of equally spaced "references" on an entity that can then be snapped to. ie: placing "X" amount of snap points on a line or circle and snapping to and from them. VERY handy for layout work.
4. The ability to shrink the command line area down to one history line and an input line. YUP, I use it on a netbook in the field and space is at a premium.