Need Atom feeds for issues. PSHB support. Optional XMPP notification support.

Can you provide a patch?

Can you point me to the code that should be patched?

That depends on how you are planning to implement it. I guess it would make sense to create it as a new extension, adding a new file in http://svn.python.org/view/tracker/instances/python-dev/extensions/. Once that is done you would just have to add some link/button to the templates, in http://svn.python.org/view/tracker/instances/python-dev/html/ (e.g. in page.html if you want to add it in the menu or in issue.item.html if you want to add it to the issue page).

Do we collaborate with upstream? Why not to add this feature there? What version of Roundup is run by pydotorg?

Being an extension it can be implemented and tested here first, and if it works well it can always be contribute upstream later (I don't know roundup policies about extensions though).