OK, this works indeed, although I had to overcome some quirks of 3DGS to make it work. They are described here so other people don't repeat them...

WED won't find models that are not in the same directory than the level. Since the level is in no directory before being saved, it won't find any models until you save the level.

How come you have to reload the level in WED for it to recognise new behaviours? That's why I always had an empty list there...

It's just video_mode = 1;, without the var. You don't want to declare those as local variables, but change their value so level_load behaves correctly. I assume this is the way to configure 3DGS? By assigning values to global variables?

Cheers,
Jonas