Outstanding! Works like a charm. I'll sure be interested to find out what those others do.
BTW, ALLOW_USER_FONT does exactly what you are thinking. NiLuJe, bless his dedicated soul, posted a thread yesterday on how to use it: https://www.mobileread.com/forums/showthread.php?t=99355
Also, if I had to guess, I'd bet that the two-column view would only be an option if the display were rotated to landscape mode.