Please bear with me as I am not a designer. I never have used such a software (Blender or LW - only Google’s SketchUp)…
we can think of a simulator based on the FL engine later, first off we need something that would convert the pure thn to an animation script and back again.
We actually have the FL-ED Thorn for the THN to script part. And there is the LUA Compiler with FL-ED Thorn util. I am working on an interface (GUI) for the LUA Compiler.
Unless your are refering to a script to use in the Blender/LW software. In this case we will have to decide which one we will invest on because they are not using the same script language (Python vs Lscript).