Thank you for your suggestion. We have been toying with this idea, too, but it will require a sync server built and maintained by us. We have many ideas to improve data capture and synchronization for the forthcoming versions of DEVONthink and DEVONthink To Go, and are already actively building the architecture.
I hope the architecture does not use cloud services for synching. One reason I use DT products is they keep things on my local network and not splatter them all over the Internet.