I would like to know if it is possible to
1) scroll /zoom in and out while in freehand mode;
2) include palm rejection in freehand;
3) have an eraser instead of using the back button;
help is appreciated.
(FYI, i am working on a Samsung Galaxy 10.1 2014 edition, and Android 5.1.1)
If you are referring to the free handshapes tool, then it is not possible to scroll/ zoom after selecting the tool.
There is no option to include palm rejection and for eraser.
If you wish you can fill the feature request for this here: Feature Request/Bug Report Form