Currently the minimap is static until you click on it, and the view jumps to the proportional location of the mouse. This is fine for smallish documents, but for very long docs (e.g. 2000 lines), clicking a visual representation in the minimap can end up scrolling somewhere totally else.
I suggest scrolling the minimap as the mouse moves over it such that where you click is where you will ultimately navigate to. Once you mouse off of it, it should go back to the current normal view.