Comment 2 for bug 1786727

The click/not click issue is because the EDIT_TOOL goes into "pick reference point for block" mode, but this isn't terribly obvious if you're not looking at the status bar.

I don't think reference-point-copy should be the default action. Perhaps a modifier-key option?

And for modes like this, I think the Length-Tuning-Status-Box might be a better way to communicate the mode.

There's also no context menu for the mode, which means there's no visual way to cancel it (esc does work).