It's not documented in the reference patches yet, but in doc/4.data.structures/*.pd
"f(0:100)(0:20)" is documented in doc/4.data.structures/09.scaling.pd
how about some of these features for the data structures:
mouse click detection
"set" flag or any other dynamic handling possibility
a consistent colour plan for the several parts of pd (gui-30?, gui-rgb,
data-s, gem) that would also be consistent with any of the present
standards (there was a thread about it some time ago). If you look at my
patch "farben-data-s" in my puredata folder (address below), you'll see
that there aren't that many colours for the data-s, since lots of them are
repeated.