user modifications directory?

A contrib directory is a good idea if you're prepared to maintain one.

Make sure that things placed there have a point person who can answer
questions about them-- and mark things that have no point person.

Best Regards,

      Adobe Systems                 Tel: 1 (408) 536 3945   (W14-129)
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    Disclaimer: The opinions expressed are my own and in no way should be taken
as representative of my employer, Adobe Systems Inc.