Hi Moka, I plan on getting at least the projecting curves to surfaces done pretty soon - drawing on surfaces and extruding in camera direction will have to go on the future version wishlist for now.

At moment the workaround for projecting curves is to trim the surface with the curve - the trim will do a built-in projection. Then select the edge curve around the new hole, do Edit/Copy to the clipboard, undo the trim, and then Paste in the copied edge curve.

- Michael