I'm pretty sure Chris could set a max height and use a vert scrollbar if it is exceeded. Chris, I would set it for at least 50 lines or so.
The syntactic keyword coloring php script is done, and works very well (if I do say so myself

). It would be online already, but the actual integration into the phpBB code isn't very straightforward. Hopefully it will be online later today.
The only thing that is not working to my knowledge is coloring #include strings:
#include <stdio.h>
In that example the stdio.h is not colored like a string.
If we can figure out a way to pass parameters via the [ code ] tags, then I will allow additional formatting options, like line numbers, and how many spaces a tab should be translated into (I'm currently using 4, which is what eVC uses). I can perhaps add support for additional languages besides C / C++, which could also be specified as a parameter in the code tag.
Dan East