I've picked up a few odds and ends you can do to modify your scripts by reading the forums.
e.g., you can put [extruder0_temperature] instead of hard coding a temperature.
I also saw [old_tool] [new_tool] referenced by someone for the tool change scripts.
Question is.. I can't find the source of these customizations. Is there documentation somewhere that I"m missing? How do I find out all the other variables I might be able to use for instance?