cegui is a Ubuntu Universe package.
First I think you should report the bug here. We generally refer people to How do I report a bug? for help in filing bugs.
Second, you should check upstream (Debian and cegui.org.uk) to see if there is already a bug report for the bug you are seeing.
If there isn't already a fix it would be most effective if you could develop a patch for the package to fix the problem, or at least diagnose it as thoroughly as possible. If you can come up with a patch you can attach it to each of the bug reports. Getting upstream to accept the patch or develop one may convince the Ubuntu MOTU team that the patch is good.
See this page for the procedure to get the patch sponsored into Ubuntu Universe for the current development release. It's still not too late to get some patches into Ubuntu Universe for 12.10 but soon will be as its release is imminent. Getting a patch or new release into the development release is usually the first step in getting it into older releases (for reasons of quality assurance).
The MOTU team hangs out at irc://irc.freenode.net/#ubuntu-motu.