Confluence RSS Feed Builder does not support "showDiff" any more

We are currently in the process of upgrading our Confluence instance from 3.5 to 4.2. Quite a few users complained that the very useful "showDiff" feature of the RSS Feed generation of Confluence, mentioned e.g. here: https://confluence.atlassian.com/display/CONF35/Using+the+RSS+Feed+Builder is not available any more, and also not mentioned any more in the Confluence 4.x documentarion: https://confluence.atlassian.com/display/DOC/Using+the+RSS+Feed+Builder

There is no release note saying this feature was removed, but
confluence-4.2.8-source/confluence-project/confluence-core/confluence/src/java/com/atlassian/confluence/rss/FeedProperties.java

says:

/**

• @return since 4.0 this will always return false.
• @deprecated Since 4.0. Diffs are no longer supported in RSS feeds.
  */
  @Deprecated
  public boolean isShowDiff() { return false; }

As we are using RSS Feeds to "keep current", it is unfortunate that this lovely feature was "lost" somewhere, and PLEASE give it back to us

At least please fix your documentation / release notes that this feature is gone.