ShockEd: editing .mis files containing shemp textures?

[66682541779dfCrux Argentum]

I wanted to make a little modification to medsci1 and noticed that the wall monitors are all reset to Jorge when I load the mission into ShockEd.
Now I am assuming that ShockEd does not find the texture family because the shemp monitors are not contained within tech but instead in
custom families named techw and techc. I tried to add those families using the add_family in the texture dropdown and typing the names but
that didn't work.

I have read some tutorials on ShockEd but so far I didn't figure out what to do about it. If somebody could just point me into the right direction
where I have to look for information I would be grateful.