The idea is to have a keyboard shortcut assigned to a mode in astropad that will make the mouse move relative with the pen input (or finger input). Basically the iPad would become a typical trackpad for as long as you hold an assigned shortcut.
This sounds probably like a strange feature suggestion at first but I actually think this could make things much more efficient if you consider the following problem: Since the iPad Pro and Macbook Pro have different aspect ratio I don’t have my full screen showing on the iPad but a smaller part of it. (I know there is fullscreen mode but we loose too much screen space with it and the pixel interpolation is bad, so I don’t want to use it).
So when I draw stuff everything is fine. But when I interact with the interface of e.g. Photoshop I reach for my mouse and look at my actual Macbook screen. First because there is no annoying pixelation there and second because some parts of the interface are not shown on my iPad for said reason. Reaching for the mouse is ok, but it would be way quicker if I could just hold a keyboard shortcut and move the mouse cursor on my macbook by touching the iPad with the Pencil. Just like you do with your finger on a trackpad. The mouse input would need to be relative and not absolute for this of course. The advance here is that you don’t have to put the pencil away. As you usually have your other hand on the keyboard anyway (to use other shortcuts) all the time anyway this would get very efficient.