Hi Kirk,
Thanks, as always, for responding.
I suppose I could create a folder for each day of shooting (I already have one for each week with 3,000-5,000 photos) but I'm trying to decrease the steps in my workflow, not increase them. My office time is under greater and greater constraints as we're expected to do more work with less time and resources. (Which I why I no longer have the space to store the recent photos locally) I am already accessing the data via AFP over a gigabit network consisting of three Macs and a gigabit switch so I don't think I can speed that up.
I definitely understand why there could be issues if the directory being shown isn't up to date, and why the auto re-scan is the default. But I also realize that due to the way OS X works, Photo Mechanic isn't always capable of keeping the proof sheet current anyway. This hasn't caused any problems thus far.
Obviously, I wouldn't expect the default auto-rescan behavior to be changed by default, but I'd gladly trade the odd error message for the ability to disable the behavior. Especially since I routinely edit on PM proof sheets that aren't current anyway.
I know this usage isn't normal or even preferable. I'd love to have the extra time at work to keep up with editing, sorting, and captioning, but that's not an option for me right now. I can't blame you for designing your software the way you think it ought to be, but I had to try.