As I was looking aimlessless through TWHL, I realised what it was missing...
A Prefab Section!
What I propose is a section where mappers can post their own prefabs. To encourage people to post them, you could have an award for people who... well... post great prefabs.
I know, a section like this might take the origionality out of some maps... although... when you program, you do not do all the code from scratch, but take parts from what is already there. As "Modders", thats pretty much our job.