The app in question targets your typical mouse/trackpad + keyboard users.
Actually having someone draw using pencil+paper (e.g. on a paper prototype) misses the point which is that it sucks to draw with a mouse!
I don't have much (any) development resources to spend putting a lot of code behind the prototype.
In short, I'm stuck: if I go too "lo-fi" I miss the primary pain point. And "hi-fi" has been deemed too expensive in the short-term.
Thoughts? Other options? Tools?