Oh god I remember that too. Sven Coop 3.0 was the ultimate "chill out" mod where you could fuck around, listen to HLSS music, and play weird levels that involved you doing things like going through obstacle cources where the goal was to survive as long as possible, turn yourself into a human basketball, play classic arcade games like Donkey Kong in first person, dick around in a Resident evil-themed level, and run for dear life after activating a self-destruct sequence in a highrise building.
Did 4.0 get rid of that feeling in favor of tacticlol shit? :(
I've done this in 4.0 and above for a while, as long as the community is still active this will still keep happening.