See last paragraph in referenced email to gentoo-dev
I would like to see this implemented, everytime I run revdep-rebuild, I have to go through the License Agreement of openoffice and all my options in it are lost, like the tooltip and the help agent are back plus my things in Tools/Autocorrect/Options are all checked and I hate them, I always uncheck them all.
No developers have ever expressed any real interest in this feature and with EAPI 5 coming the usage of revdep-rebuild will dwindle as package managers are able to rebuild packages automatically.