I know maybe QCAD is more a professional, technical sw but having this option with the precision drawing of QCAD, would be perfect.. at least for me (I'm a graphic designer) Maybe for most users it's useless.
Do you guys know the site myoats
Just with a few lines it generates paterns in a circle and shows the result in real time.
The only problem you have to draw online.. you don't have the precision of a CAD sw.
I know this is even more complex than the one I wrote earlier, but it's just a thought