This is going to sound really weird, but I was able to create a decent trackpad signature once I got into the right mental state. I held my pointer finger betw

This is going to sound really weird, but I was able to create a decent trackpad signature once I got into the right mental state. I held my pointer finger between my thumb and middle finger, and made myself really think of it as a pencil. I looked down at the trackpad as I wrote (rather than at the screen), and tried to visualize the trail it would leave on the surface.