It would be super cool to have an option for triggering MiMoSim when user starts to move finger from one of the trackpad edges, so that you don't need to hold CTRL key. It would allow for complete one-finger scrolling, and this is how similar circular scrolling feature works in KDE Plasma (Linux), and how it worked with older Synaptics drivers on Windows (so-called "ChiralMotion").
Video demonstration here and here.
"P1 position" in that case could be the center of a touchpad.