Have you ever needed a servlet-like ability to inject some server-generated HTML directly into the DOM but still want to be within the Richfaces environment? Sure you can use JSF's <f:verbatim> tag but...this tag (at least in my JSF implementation) has some undesirable caching with this tag that makes rerendering come from the cache--not good if your backing server-side data changed!
The proposed feature is the <rich:verbatim> tag. This works within Richface's environment (so rerendering etc. works just fine) and allows you to insert any server-generated HTML code into the DOM.
Why would you want to do this? Sometimes you just need to bypass JSF, for example for performance reasons. JSF is particularly performance-challenged when rendering very large tables, as I outlined here: http://seamframework.org/Community/LargeTablePerformance2IgnoreOtherPost
Using <rich:verbatim> gets around this limitation nicely. As an added advantage, since Richfaces is well-integrated w/Seam your server-side code has full access to Seam's contexts, which a true servlet would not.
I've got a patch to the 3.3.1.GA source that implements this tag, which I will attach to this ticket if JIRA will let me.