[NTG-context] quote characters in luatex

In my experiments with luatex, there's one thing that may be surprising for many users: we have come to expect that the characters ` and ' in our input files map to single left and single right quotation marks. luatex just typesets them "verbatim," so to speak. It converts the combination `` and '' to double quotation marks, however. So my question: wouldn't it make sense to convert the single marks as well? (And please don't tell me "Oh but you should use \quote {} instead of ` '." I know that, but I guess that many users have hundreds of old documents where they use `'. Moreover, ' also creates the apostrophe character, which cannot be avoided.) Best Thomas