The drawcall minimizer can handle textures with and without night textures mixed.
I'll try to look at the crash tonight. Didn't have time yesterday evening. But I'm sure it's a bug, since MCX should not crash.
I suspect that the aircraft.cfg file contains some point that is further away from the aircraft. Can you try to turn these points on in the preview to see if that's the case?
How do you see default zoom levels to work?
If you export a mdl file without PBR materials with the 4.4 or 4.5 SDK it will generate the v4 MDL format instead of the 4.4 mdl format automatically. So no need to select a different exporter for that.
Not sure what happens if you mix materials.
I would consider 4.4 and 4.5 as equal, since they can both make the 4.4 mdl format that includes the PBR settings. It makes sense to still support the old v4 as well, since it is a different mdl format from v2 and v4.4.