I just have an idea to add a bit more fun to the maps. I uploaded a stripper example and a pic. (only tested on l4d1)
You can see the stripper in 2nd level of sacrifice where the small pond is.
Basically I created a noodle tongue monster with trigger hurts and curly water around.
So if you walk in, the noodle monster would hurt you.
Since I am not capable of doing these kind of plugins, maybe someone else take it as an idea.
So here is what is needed (at least i think so).
Some way to place the noddle monster ofc.
Ideal would be to point to a water surface and use a command like !placenoodles as admin.
So the height of the water surface and position where you point as reference point to spawn the entities.
Maybe something like !savenoodles to save them.
!listnoodles for a list of all placed noodles on the map and then maybe a way to delete them.
cfg should be per map base.
That way you could create nice places all over the l4d maps.
As a nice touch maybe add a sound emitting entity at the noodles like water splash or so.