Inline GLSL in Q3 shader files?

Is it possible to add GLSL effects into the standard Q3 like texture shaders used by mappers?
ioQuake3 seems to have a nice way of doing it:
http://openarena.wikia.com/wiki/GLSL#On_...ader_files

Edit: this topic has some nice downloadable examples:
http://openarena.ws/board/index.php?topic=4767.0

From having a quick look at the sources, I would say it doesn't...

Is that not a specific OA extension to the Q3 shader format?

It isn't standard q3 shader behavior, but rather a modification of it that was implemented in ioQuake3 I think.

Would be great if something like that was supported in DP also though.

A bit OT but Qfusion has moved the entire Q3 shader handling from the CPU to the GPU.
Besides giving a nice speed boost, this would making inline GLSL shaders probably very easy.
http://www.warsow.net/forum/thread/t/218761#post-218761
Not sure just how difficult it would be to transfer this feature, but at least the general concept could be integrated into DP also.