Michael - I couldn't agree more about middle mouse push - that combined with wheel zoom and the space bar toggle

PG - I think you need the ini file fix to get the spacebar toggle back to how it used to be - ie press space bar and keep pressed you are in selector tool, release spacebar and you are back in the tool you were in before

As far as I know that precise behaviour cannot be done with the customise key short cuts - it requires two keystrokes to toggle

sometimes that is more useful - but mostly I prefer the first