I find it easier to draw with a tablet and look at the screen then to draw on a touch screen with the stylus obsuring my work. Also the tablet can draw very differently depending on th screen magnification setting.

There was a wonderful tiny Mac app I used to use in the early nineties that averaged out the shake of my Parkinson's. I miss it desperately. They sold the name to a flow chart making app and the code to Flash... if you can obtain Flash and draw with it you will get the dumbed down version of what Smart Draw used to do supressing hand tremor and even just poor drawing ability.

Does anyone know a more user friendly software using shape recognition and tremor supression?

Tricks you can do are tracing drawings slipped under the tablet overlay sheet, scanning drawings to used a guides in your paint program, using raster shapes in your drawing program as guides, and drawing very big with slightly thicker lines and down sampling the resolution... those little newspaper cartoons are actually drawn quite large, commercial artists have always retraced and reduce scaled their drawing to make the look tighter.

A lot of digital artists just scan pencil drawings and clean them up on the computer.

Signing your name over and over is good advise. Drawing is much more "somatic" then people realize. I was a drawing teacher for many years so pardon my "presumptuos tone"