I would be nice to have an option to simply type cmd/ctrl+J and type "end" or "last" and go to the end of the document
without using mouse.
There's already a shorcut for that. Cmd (Ctrl) + Shift + Page Down.
For that matter, simply "End" will take you to the last spread.
Peter's keybinding takes you to the last page.
Usually the two are close enough that it doesn't matter much, and End is easier to type...