It's obvious that Photo Mechanic makes the vast majority of tasks must faster and easier than other programs etc.
Two things I would like is a way to go from the IPTC/captioning screen straight to an editor without having to come out of the screen and then going to your editor. I think this would help cut down the workflow time.
Also, a way that, after you've edited your photos in PS (for example) and the images are saved in to a folder (ready for exporting), PM automatically shows that folder. I'm not sure if this can already be done (?) but it would be useful.