Many thanks to both of you for your helpful and informative responses!
@DNSB — I would certainly consider myself part of typography geekdom; I have installed my favorite book font,
Dolly Pro from the Underware Type foundry, which works quite well on the Nia's screen. There are many things I still don't quite understand: (1) What advantages does the EPub render offer typographically? (2) On my desktop I tend to stick to OTF, but is there any disadvantage to OTF on device? (3) Standard ligatures are enabled as far as I can tell, but is there a mechanism to enable discretionary ligatures or other opentype features (I assume this has to be a patch of some sort)?
Thanks again!