AngelScript allow to debug scripts:
angelcode.com/angelscript/sd … debug.html
angelcode.com/angelscript/sd … ugger.html
May be add script debugging in scene editor, but it must be rewriten on C++ code.
I think what may be add simple showing variables and their values to Windows console and write to log-file and continue execute. May be add command line flags for set breakpoint on specific file and line.