I use the great Changelogger plugin, which adds plugin version history to the plugins page when there is an update. Although I would like it to, it doesn’t work from the updates page where you can update WordPress core, plugins, and themes.
How and where can a new hook for that page be requested so that the changelogs can be added to that page too?
You’ll want to make a new ticket here: http://core.trac.wordpress.org/
Explain why you want a new hook and how it could be used. Including a patch file also goes a long ways towards getting the hook included in WordPress.
Things will move the quickest if you’re willing to do some work on your own.
If your reasoning is well thought-out you might not need to do all 4 … but just asking for a patch won’t get you anywhere unless you’re willing (or know someone who is) to write it. Mentioning it in these three places (Trac, WP-Hackers, IRC) is the best way to involve a core developer and either get it committed to core or get the feedback you need to build a new patch.
I would send a message to wp-hackers, or create a ticket and submit a patch on the WordPress trac.
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