Peter -
Thanks for the link to the thread with the discussion about this topic. I am very happy to learn the option to create a guideline from a node point in the middle of an operation, by pressing and holding down the mouse while gesturing in the direction of the intended guideline. This works beautifully.
On my USA MacBook Pro keyboard, the top left key underneath ESC is a back-quote or back-accent ` and if you press the Shift key modifier you get a tilde ~.
When I tried to use that key for the Force Guideline option it didn't do anything. I have resorted to creating new keyboard shortcuts:
` - Force Guidelines
Shift-` - Remove All Guidelines (this is very necessary now that hitting Escape does not remove guidelines)
Control-` - Create Guideline Segment (Option-` did not work, it beeped at me)
I don't know if there is a conflict with the Mac OS with the default § key, or if this is a non-standard character that doesn't exist on keyboards in the U.S. (for Mac only?). It would be interesting to figure this out. Is there anyone from Graphisoft reading this who can clarify the cause of the issue? Can anyone else who is on a Mac (in the U.S. or elsewhere) verify if there is a key on an extended or full keyboard (not a laptop) that has this character?