Thanks for your suggestion! A first step towards this is already done in the current development version of Inkscape, which provides a Live Path Effect called "Perspective Path". It allows you to draw an arbitrary path in the perspective specified by a 3D box while leaving the original path fully editable. Note that this feature is work in progress and still needs to be (and will be :)) improved in the future.
Thanks for your suggestion! A first step towards this is already done in the current development version of Inkscape, which provides a Live Path Effect called "Perspective Path". It allows you to draw an arbitrary path in the perspective specified by a 3D box while leaving the original path fully editable. Note that this feature is work in progress and still needs to be (and will be :)) improved in the future.