Sure. A real brush system is first on our list for the next big version (like v6.0 – not alpha). Probably 2021.
Most obvious would be to support the Photoshop brush format, so we could utilise all the great brushes that have been made for Photoshop. However that is not necessarily easy or even possible to do. We will do our best to make it happen though! You see, the challenge is that the Animation Paper line engine is special with its ability to scale without any degradation or blur. That’s not like any other bitmap based engines.