I suggest using Milkshape to model, then use something else to script it, doesn't Blender let you script things?
I don't know if Milshape 3D does because I'm not modelling anything ATM cause I have no suggestions for what to model.
I don't think you understand what scripting is. notepad lets you script. you don't need a special program for it, although some make it easier
in Blender, you can use Python to automate certain modeling tasks (at least, I think so), or you can use it in the Blender game engine, which, by the way, I don't think anyone really suggests using
but Blender doesn't make it any easier to make the script for something in Blockland