On my install, the plugin options in the admin has no "save button". Some are selected, some are not, and I can't change em.

There was an error in one of the plugins that probably caused this. It is corrected in tonight's build.

Is there a way to get access to "builds" that don't require installing, or upgrading everything? For instance, the above issue with "plugins", can we view the actual code that was changed, and just add it to our install? I've gone to bug tracker, and seen "browse source", by the way.

It's the same just to copy everything and run the "upgrade" - if nothing needs to be done nothing will be

If you want though, just grab the changed file from SVN and upload that, overwriting the existing one. That will usually be OK so long as a database table was not changed.

To see what's changed, look at the "Timeline" view in Trac and find the changeset.