Also sucessfully tested cases 1, 2 and 12.

Only number 13. The client maps where straight up subscribed from the steam workshop. I tested with Diescraper, and I Hate Mountains 2 which is multi-part on the workshop.

This seems to be fixed in the stable version of the game now. I tested it with workshop campaigns on the client and directly downloaded campaigns on the server.

The workshop should display items in the recent menu sorted after when last updated, rather than created. Right now there isn't that much incentive to update workshop content, since no one will notice. Bumping newly updated content up in visibility would encourage content makers to maintain and add features to their work.

One more menu related issue; it's still not possible to select custom maps from the "Change Chapter" dialog in survival.

http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=144336617

There seems to be a bug with the BBcode interpreter used by steam. It seems to parse the square brackets used in arrays as tags, even when enclosed by code and/or noparse tags. This causes the contents of an array to be printed twice on the screen.

This is now up as a more detailed guide in the L4D2 beta section.
http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=143407178

Can't you just do it like this?

It's a very fun mutation to play around in. Love it.

I has some issues with the explosion sound though, it only seems to play occationally, usually when the explosions are triggered by other zombies.

Also, it would be cool if you could pass on the killer as an activator to the explosion, so it tracks it as friendly fire. I'm not sure if that's possible to pass to an entity group though. It might be possible using DoEntFire if the game event passes along the attacker.

Nice work, especially on that addonconfg.cfg part.