I had to write a custom plugin for this and it has to sort of compete with the native processing of posts as well since the syntax highlighter wants absolutely ZERO br tags in the source code and IPB wants to put br tags in. Right now the RTE for this software is also very basic in terms of what you can add on plugin wise.. Version 3.2 of IPB can't get here fast enough for me. I want tags in the forums and and the brand new RTE that includes your own personal media library that you can upload images and other files to to link from in posts. Maybe then we'll get some sophistication with the plugins we can write.. finally.
The "Alert" when a language wasn't found could be commented out. (or does it show only for the poster?)
Maybe if the language isn't present it could be defaulted to cpp? At least that way the format of the box can be kept and the literals will still be colored.