For help with general CEGUI usage: - Questions about the usage of CEGUI and its features, if not explained in the documentation. - Problems with the CMAKE configuration or problems occuring during the build process/compilation. - Errors or unexpected behaviour.
the supported images depend on the image library which is being used. However Cegui does not support animations by itself; you should handle such things yourself...
It's not really hacking though: you can nicely make a wrapper class which -based on time deltas- switches to different imagery.