With Move Cursor On Click enabled..
Use the mouse to drag select a few lines of text near the top of the buffer.
Now, click near the bottom of the minimap -- the selection is extended from where you started the click-drag selection. This behaves similar to shift+click in how the selection is extended.
This doesn't happen when you use shift+Arrows to select some text, just a mouse drag select.
NICE: Use shift+arrows to select text.
Hold SHIFT and click in the minimap -- the selection is extended - seems like this is good.