The lack of source bots is a direct result of the server plugin interfaces lacking some very critical functionality that is needed to make a fully functional bot.
My bots play HL2DM just fine, but with the limitations of the server interface they are lacking in some areas, and valve continues to ignore our requests for the added functionality.
KWo, can you get Bailopan to take a few minutes to post about how(and if) he got around these limitations? That's what I'm interested in more than downloading his bot.
Here's a thread with info on what is missing, and is the primary reason there are no fully functional 3rd party bots.
http://forums.bots-united.com/showthread.php?t=4026
and here's some screens of my unreleased hl2dm support for my bots.
http://www.omni-bot.de/e107/forum_viewtopic.php?4.375