Indeed it would be - but this feature was suggested in Sept 2015, and then several times in other topics
- Sept 2015: "Back" and "Forward" for document navigation
- May 2016: "Back" Button in PDF viewer
- June 2016: Command to get back to reading after clicking an in-text reference
but remains not addressed, so my hopes are low, despite the fact that @stefan said it was on the list to be fixed as of Sept 2015: