All these are my personal opinions on a Sunday evening, no Nokia voice here.

lcuk, I for one also think you should concentrate on the sketch related features. This is what makes liqbase interesting, the rest of features can be beaten elsewhere. Computer texts and photos to be offered only as complements to sketching (e.g. letting the user scratch notes on top of texts or images). About the rest, either drop it or deal with it in different apps (or plugins, if you really want to keep everything under the same umbrella).

Note that liqbase needs still a lot of work in usability, consistent layout and probably also pure stability, testing... Then if your project is successful enhancement requests will arrive e.g. what about other geometries apart from rectangles. The wider your feature set, the more complicated to have everything stable and remarkably original.

Also put top performance by default. Don't expect users to scan all the settings before being convinced or deceived, and liqbase feels much better/useful with top performance.