HeXen Style Doors for HeXen Mod?

[Mad Squirrel]

In the GZDoom Builder, I want to be able to create doors that opened sideways like the ones in the Hexen game, not up and down like the ones for Doom and Heretic. I can only guess that they run by an ACS script, but I don't know what it is. I'm not finding anything on the internet relating to this. Anything?