Is this controlled by some esoteric parameter that I can't find, or is it simply not possible?
Parameter 0078#2 suggests that macro variables can be entered in MDI (they can't), but I suspect it is referring to the actual macro screen rather than MDI mode.
In any case setting it either way has no impact on G65 in MDI, and I can't see any other parameters that seem relevant.
I found an ancient post on cnczone where one guy had two OM-C's, and one could do G65 in MDI and the other couldn't, which kind of implies there must be a parameter to enable this - he wanted to know how to enable it on the second machine, but there were no responses.
Parameter 0078#2 suggests that macro variables can be entered in MDI (they can't), but I suspect it is referring to the actual macro screen rather than MDI mode.
In any case setting it either way has no impact on G65 in MDI, and I can't see any other parameters that seem relevant.
I found an ancient post on cnczone where one guy had two OM-C's, and one could do G65 in MDI and the other couldn't, which kind of implies there must be a parameter to enable this - he wanted to know how to enable it on the second machine, but there were no responses.