The description about the G2 coding style (Unix-style line delimiters) conflicts with the information given in the link to the Subversion developer info. There it recommends setting auto-properties for new files to native eol style, which is CRLF on Windows and LF on Unix. If the G2 coding style is truly Unix-style line delimiters, then the svn eol-style should be set to LF, and the Eclipse editor should be set to Unix-style line delimiters as described. Note that the Gallery2 SVN repository does not seem to have any properties set, so this issue is unresolved.
Eclipse 3.3 PDT: There is no Windows->Preferences->Capabilities where from you can disable Java (.class - locked), but, only by setting the content types and adding the .class to PHP, you can use eclipse 3.3 as php editor for .class files. I didn't see any secondary problems either.
