hm, i'm certainly not against this idea, as i'm not opposed to sharing
what i've done, if it is interesting for others. but i don't use pd-extended myself a a lot and actually i don't know the
process of "getting externals into the system".
that is quite easy: contact directly H-C Steiner to get a svn account,
then upload your code - or ask him more about how to do it.
also, i don't know about the policy of pd-extended or where it's aiming
at, but i guess that the externals that get in there, must have somehow
proven to be useful to many users.
ahhh, there's no policy. anyone who manifests interest in joining in joins
in, I guess. there's also no admittance test, so everyone just puts in the
code he wants (sometimes even buggy code). which makes the whole a thing
not really totally ÃŒbersichtlich (one of the GSC projects was to organize
and catalog the externals on pd-ext).
but pd-ext is quite used (only hardcore people/code developers prefer
pd-van), and it's the easiest way to make the code available to everyone.
of course it can happen that no one notices it's there, because there are
around 2000+ files in the /extra folder of pd-ext.