[tex-live] context default papersize set in cont-sys.tex after \endinput?

[Karl Berry]

    > \protect \endinput
    > \setuppapersize[letter][letter]

It would be wasted effort to look at this until Hans and Taco

a) feel it's time to update ConTeXt in TL, and

b) advise us about the recommended way to set the paper size site-wide,
   ie, specifically what commands to put in cont-sys.tex (and if that is
   still the right file, and what directory it should be in).

Hans/Taco?

Thanks,
Karl