You can clone with
HTTPS or Subversion.
A keyboard shortcut binding stores the position in (each?) timeline. This means either "cursor position" and/or "cursor position and current timeline view".
Another key binding restores the bookmarked position/view: after invoking, the view (or cursor position) is restored where it was when the command above invoked.
This feature should store its state in a file so that it survives restarts of Emacs or can be synchronized with Emacs settings on other computers as well.
With this feature I can jump to the last "defined" view. I personally would use it to mark "to what tweet I already read the timeline tweets".
I am waiting for such a feature for years ;-)