I have had a number of different situations where I wanted to take some kind of action when a field changed. For example, if I want to track the date and time that a field was changed, or insert a record in an activity log but only if there was actually something changed.
I envision it as part of the record rules to say:
WHEN [ Field Name ] was modified
If we could send an email only if a status field changes, and similar things, it would make Knack super-extra-powerful and awesome.
Thanks for considering!