If you would like to write Ubuntu-specific information about LIRC configuration, please feel free to put it in the Ubuntu LIRC page you referenced. It does not belong in the overall LIRC page, especially when it is version or sub-distro specific. This kind of thing is how we end up with stale, wrong, and outdated information polluting overall topic articles.
Understand the sentiment, but based on that the whole mythbuntu section should be eliminated, or a note on the difference between mythbuntu and std ubuntu would make sense. Maybe a separate section on distro-specific LIRC configs, away from the main page?
Sure, feel free to add all the information to the Ubuntu/Mythbuntu specific page and remove what is on the LIRC page.