Using custom things from mods in GZ Doom Builder?

If I wanted to take the gore nests from the D4D addons, and make them into a thing in GZDB so I can manually place them instead of having them randomly generated around the map, how difficult would that be? Would I have to get into writing my own DECORATE lump and defining everything and all that messy stuff or is there another way?

Why would you want to write your own DECORATE lump for GZDB?
Are these actors ZScript?
If so, then it's too dangerous to go alone, take this. It supports ZScript.