Wouldn't adding a note to shortcuts accomplish pinning a Note to "The Main List pane"? Adding an icon, Asterix, or a number to the Note will move the Note to the top of the list under shortcuts. Furthermore, I can see 3 recent notes under shortcuts in the android app. I do agree, a pin section would be convenient. If the Evernote developers would add the Option "add to shortcuts and pin," this would work.
I would also like to pin or bring a Note to the top of the "secondary Notebook List pane."
the pane that I am referring to, is the one that lets you view in small, large and card view. This pane also allows you to sort by date updated, date created, and title.