"Position in Collection" Token for Exporting

I'm proposing that a new token -- to be used when exporting images -- is made available with the name "collection position" (or similar). 

During exporting, this token should be replaced by the position of the image in the selected collection, e.g., for the first image it becomes "1", for the second one it becomes "2", etc. Potentially it could be useful to have the option to choose left padding with zeros, e.g., "001", "002", etc. 

The applications are manifold. One of them concerns exporting images to be used by another software, e.g., an application that can create photo albums. Often, after having processed and exported all images in C1, one notices within the other software that one or a few more images require changes. In this case, it would be highly useful if one could simply go back to C1, change the images, and only export the changed images again.

Currently, one has to accomplish that by manually setting the output counter to the values needed -- one by one, and after having figured out what number the images have in the output folder -- and exporting them all individually. 

Another application for the feature is the situation when a client requests a certain image again (perhaps with modifications) and provides the image number. One can then quickly export the respective image, and the correct number will be automatically be added to the filename. No need to manually set the output counter to the respective value. 

For these and other cases, it would be much easier, if C1 could figure out the correct output counters using the position of the images within their collection. 

Ideally, this feature would be accompanied by the ability to overwrite existing output (exported) files. However, it would be helpful on its own as well.

Another advantage of using "collection position" rather than the standard "output counter" would be the fact that one wouldn't have to reset the output counter time and again before one exports images from a collection again. I always want to start the numbering of the images at "1". Never ever, did I make use of the fact that the next export starts with an output counter that continues a sequence from the last export process. Hence, this means always having to always manually reset the output counter before I export.