Quick Find is a great feature, but it would be nice to have the ability to constrain the found set via a Quick Find. I suppose for consistency, an Extend Quick Find step could also be included, but I don't foresee myself using it as often.
The only way to replicate this feature currently is to create a new find request for every field with Quick Find enabled, then use the Constrain Found Set step. With the proposed script step, it could be done in a single step. The main problem with the currently available work-around is there is no way to programmatically get a list of fields with Quick Find enabled. Because of this, it's inevitable that the script and the actual Quick Find feature will end up operating on a different set of fields (because I will enable Quick Find on a field on the layout, but I will forget to add to the script, or vice-versa).