Regarding auto-scroll on revisit: I have not implemented a full automatic scroll restore yet, especially for pages with dynamic loading or user scripts. Doing this reliably across all sites turns out to be fairly complex. That said, I did improve the jump flow on the 'all marks' page, including ordering newly added items at the top. I am going to close this issue as partially addressed for now.
I will also think about your recommendation about making item placement configurable.
