Other minimap implementations (like the one in Microsoft Visual Studio) indicate lines that have been edited (in this case, yellow for edited lines that are unsaved and green for lines edited in the current session which have been saved). When scrolling through a source file, this is incredibly useful for finding recent edits. For example:
The darker area shows (always - not just on mouseover) the currently-displayed lines. This has already been requested here: https://forum.sublimetext.com/t/persistent-highlight-on-minimap/13460/3&hilit=minimap#p61708. The white line shows the current edit position, which is also very useful.
On the left, green and yellow indicate edited lines (saved or unsaved respectively).
I’d love to see the Sublime minimap extended to include these features.
Ideally, the green/yellow markers should also appear in the left margin of the editor itself too - but this is probably a different feature request.