Don't think so, but you can kind of simulate the experience with director_panic_forever 1 or something similar in the console. With this the horde never stops. As for increased special infected, not sure how to help there.
If the original survivors aren't playable in L4D2, I'm not paying for it.
Because, i wanted to play new maps i downloaded from the net, and i donīt find anybody to play that map, thatīs why i wanted to play SP. Oh, and whats the most downloaded survival and campaign map out there?
One Must Stand, One Must Fall.... I Stand, You Fall...
No, you can just click survival mode, make your own lobby, and start the game immediately. Of course, people could still join your game (happened to me while playing a custom map I got off L4Dmods) but I'm sure there's an option to close it from others joining.
The universe will end the day Buckethead dies. Buckethead controls the sun, the moon, and all things living. GT: Seventh Helix