I'm not sure I understand the request here.
For the purpose of clarification, I'll offer an example.
Let's say for example (This actually happened this week) that I am shooting a game on location, and and editor in another city is waiting for my post game images. This could be a wire service, a school waiting to update it's twitter feed/FB page, etc. Where speed is more of the essence than getting 25 photos in batch. In this case, I had established a dropbox folder with the editor.
After the game, I go to the press room. My laptop is ready to go, card reader is good to go, metadata template is ready to go. I update the final score in the stationery pad, and insert my card. Images come up, I apply the pad to all images. I then filter by "tagged" photos which shows me a few key images I tagged in camera during the game. Let's say there are 10 images tagged.
At this moment, what I *want* to do, is to crop and straighten the first image, and save it to the dropbox. Then edit a second image, and save it to the dropbox. Perhaps do that with 3-5 images. The purpose here is to feed the editor a few immediate images very quickly that they can run. The alternative that I do now, is to crop/straighten all 3-5 photos, jump back to the contact sheet, highlight those, do a save as, and save them to the dropbox.
It was noted earlier in the thread that if I did an save > upload on a per image basis, I'd have to wait for that operation to complete before I could move to the next image. In the dropbox paradigm, this would take less than 2 seconds to complete. I'd be willing to do that. If a process could be spawned in the background to handle the task, I'd never even have to see or worry about this, and there would be no delay in moving to the next image. However, I realized after posting this initially, that the idea would likely not gain any traction, so I just let it go. I just work around the issue by editing 2 photos initially, and submitting them, and then going back and processing normally. It's the best I can do.
I hope that helps clarify things a bit.