> I am a heavy mouse (and trackpad) user and have been for decades. Editing and refactoring code for me is all about the mouse.

It's a very interesting and surprising statement to me. For me the mouse is absolutely nowhere near convince of selecting text with keyboard. When your editor allows you to jump between paragraphs, words, ending and beginning of line (so pretty much every editor) it seems to be relatively easy to rapidly jump to place that one wants to select with couple of key strokes.