LUA

Is it worth delving in-to it? LUA. I mean, why the hell Eyeon guys chose it for Fusion? Why not python.

ok I got it: http://stackoverflow.com/questions/356160/which-game-scripting-language-is-better-to-use-lua-or-python

http://lua-users.org/wiki/LuaVersusPython

And, to summaries:

Lua uses less memory and has faster interpreter and JIT compiler. Lua C integration is cleaner.

Python has a larger standard library and a much larger ecosystem built around it.