It would be very useful to have Javascipt eval available in scripts.
I know it is often disabled for vague “security” reasons, but if Google Apps etc. can support it, so can Fibery 
USE CASE: User enters a mathematical expression, then an automation script calculates the result value and replaces the field with the calculated value.
ALSO - it could be very useful if a script could distinguish whether a specific “field changed” trigger was the result of manual input, or some other source (e.g. an automation or integration). This could actually be part of a Rules trigger definition, i.e. “Trigger when [x,y,z] Fields Changed, but only if/not changed via the Fibery UI (manually)”