Apparently Maestro does not have the ability to send the CWX macros stored in the radio. Instead it uses it's built-in WinKeyer and the only thing I've seen for macros is to program the six function keys. I would like to see something more like the way CWX is supported in SSDR.
I see a couple options. A function button could be programmed to send a CWX macro, or a pop up screen could display buttons for each CWX macro. These buttons should stay until dismissed by the user. I typically use a macro to send my callsign in a pileup.