This is not simply a feature but a more general request. It is extremely quick and easy to create solutions in FileMaker but managing a solution afterwards can be extremely painful and time consuming. FileMaker developers find themselves going layout by layout, script by script etc. searching for occurences of a field, value lists, script lines etc. etc. Although there are options to find things based on a DDR report it would be so much more helpful to be able to find & replace things.
Change every reference to field x to y
Change every reference to value list x to y
Change every script step Commit Records/Requests to Commit Records/Requests [Skip data entry validation]
Change every field with data entry with font Arial corps 11 to Helvetica Neue Light 12
The fact that any possibility for this is still lacking in FileMaker in 2015 is unforgivable. And the introduction of the new Scripting Environment without undo/redo, find & replace was a big disappointment.