show secondary coords (as readonly) in Edit Marker and Info dialog boxes
Often we need to get the exact coords of an already-drawn marker, in the secondary coord system. Right now to do this we have to change the primary coord system, since only the primary coord system shows up in the Edit Marker dialog box and the Information popup for a maker. Can you please add the display of the secondary coord system, grayed-out / read-only, to both of those displays?
Bill May commented
Extend caver456's suggestion allowing not only display but also editing of the secondary coordinates in the Edit Marker boxes. (Note that both primary and secondary coordinates of the cursor are displayed by the toolbar.)