Something I've noticed: When you import models before configuring the hookup library, the 'expected value' (unit type) doesn't get configured for model hookups. When you configure the hookup library afterwards, the expected value is still missing (warning on export: The Hookup 'you.forgot.something' has no expected value!) – even after refreshing the hookup library. Could some functionality be added to allow this data to be retrieved if it is missing, when the hookup library is refreshed? (bpy.ops.scene.scs_reload_library(library_path_attr="hookup_library_rel_path")) I assume most of the necessary functions exist, seeing as this data is populated during import, if it exists.
Ordinarily this isn't a problem for me because I'm more in the habit of making things from scratch. However, I was messing around with a friend's mod today and realized how this could be problematic for someone who imports a vehicle model with hundreds of locators for lights, etc and later needs to repair the hookups because they forgot to set up the hookup library before importing. As it stands, SCSBT is kind of unforgiving in this particular respect.
Edit:
More thoughts related to hookups: How about a selection method that allows selecting all model locators with a particular hookup assigned? Maybe a 'select similar' method that selects all model locators whose hookup assignment matches that of the active object (or even matching all hookup types in the current selection)?
I'm not really messing with trucks (paintjobs etc.), its mainly models for maps so I need stuff like concrete textures and stuff 
I will investigate options, maybe sth nice can come out of it.
