Here you go...
Re where else to find the description of the mc commands – download the Flare Styles Guide PDF (see the link in the footer in any Flare help topic). The commands were apparently added recently.
Re the topic popup style customization, covered on pg. 61 of the wokrbook, not working – the instructions in the workbook are correct. Tech support took a look, reapplied the popup style, and it worked. So either I misapplied the popup style to the link text or else I accidentally turned it off and didn’t notice that I’d done so. One of those forehead-slapping events that I mentioned.