You state no script calling as rule 11, are you just referring to the script option in things like events (for example to get the player x and y position)?

You can also do some pretty script-ish things with damage formula's for skills IIRC (like calling actor attributes, which already happens by default).

It's not like we can completely avoid touching damage formulas.

I am talking about the event scriptcalling option.

I will allow formula modifications for damage calculations, spells, etc.  Those fall in a different category than event scriptcalling.