> % automatic double-quotation "support" This works (unless you need triple-nested (double-single-double) quotes) because we usually use double-quotes in pairs. But with single quotes it's a problem in English because the right single quote doubles as apostrophe.
Still, we can do the same in groff, too (see the list archives). My favorite nightmare, however, (which no-one has implemented to date, though) is the "smart parenthesis" feature: you only need one input character, and the software decides whether it's an opening or closing parenthesis. :-)
