It would be nice to be able to see which macros have been executed and in what order in the Gcode Console. Just a note: "M98 MacroName" or similar.

Unlikely. The impedance of the coax won't match where you solder it to the antenna so you would lose lots of the TX energy before it even entered the coax

OK, thanks. I went back and looked again. There is nothing on my version (1.20beta4). I guess I need to update to the latest.

When my prior print finished and I started the next print, I couldn't remember if I had uploaded the lastest or not. It would be helpful if, after selecting the gcode, it also included the date the file was edited or uploaded.

Thanks. I am calling it explicitly with M98 and can change to end2 there but that requires editing the slicer profile so having the ability to add check boxes would be a nice feature for lazy people like me.

BTW: M0 H1 doesn't seem to work for me (why I'm using M98 instead). Even with the H1 card, the heaters are turned off when M0 H1 is called (same end.g code in the stop.g file). M98 Pend.g leaves the heaters on. Operator error or bug?

I usually shut down the print bed and extruder in my end.g file for safety. However, fairly frequently I am in a rapid turn-around mode such as where I am fitting a profile to an existing object (5 minute print, tweak and repeat). My print bed is 1/4" aluminum plate and is very slow to stabilize so I change my end to keep the bed hot and lower the extruder to just below the point where it drips. Is there a way that I can add a check box to the machine control to tell it to use end2.g instead of end.g so I can easily swap modes? Is there a better way to do what I am doing?

It would be nice to be able to see which macros have been executed and in what order in the Gcode Console. Just a note: "M98 MacroName" or similar.

Unlikely. The impedance of the coax won't match where you solder it to the antenna so you would lose lots of the TX energy before it even entered the coax

OK. Going to 1.21 solved my problems. The G10 command worked fine once I updated (same commands would not work on 1.20). For my machine with a 200x200mm bed the following now work to mirror:
M579 X-1
G10 L2 P1 X200

Undo with:
M579 X1
G10 L2 P1 X0

OK. I see the G53-59 are only supported in 1.21 and later so it looks like I need to update my firmware before proceeding (my duet is still running 1.20).

I tried the G10 (not M10 - typo in my prior post) but didn't have the L2 parameter. What does that do? (not in the duet gcode documentation)

Hmm. Cannot seem to make it work with G92, M206, or M10. The M579 works great but I cannot get it to accept the offset to bring positive coordinates back onto the bed. I guess I'll reconfigure the machine like you suggested making X0 Y0 in the center.