In hl2dm the ai of the combines , the fast zombies , the zombies (only on windows) and the other human npc's is broken.
As i know you already got a custom npc called snarks to work it might be possible to add the source code of these npc's or fixes for them into sourceop so our servers run these npc entity's as well.
As result of integrating this into sourceop or a seperate plugin your plugin will probabbly one of the most wanted plugins of the hl2dm coop scene.
Please consider it,
Many thanks.
Henky!!