I suggest when we go to any mode such like, browse mode, layout mode, find mode or if we go to scripting or relationship graph, each filemaker file should record timestamp. when I started this mode and when I finished along with user name.
Its really helpful when I want to bill my clients depending on what development time I spent.
This can be also used as security tool to find out who did what during certain time.
I wish to see this option in new version.