Lock non-door linedef options

[CrimCuttle]

I'm making a Doom UDMF map, and I want to make a platform lower and make the line passable, but you have to have a key to do so. How would I go about doing this?
~~EDIT~~
I am using GZDoom Builder.

[Gez]

In ZDoom UDMF, there's a locknumber property for linedefs. Seems to do exactly what you want.

[CrimCuttle]

Gez said:

In ZDoom UDMF, there's a locknumber property for linedefs. Seems to do exactly what you want.

Is this in ACS text, or the GUI? I didn't see it in GUI but I didn't think to look in script editor.

[scifista42]

[CrimCuttle]

scifista42 said:

http://i.imgur.com/w2g206v.png

Welp, looks like I'm blind.