To my issue. Last year I had my first trip to Africa, ended up shooting 13,000 pictures with my 5D MkII - abusive, I know!
Transferring them to my computer went all fine, as they arrange in folders after date (after all I did not shoot 13k in one day). But the issue that arose when I wanted two images with the same number in the same folder (why is another story!). I assume this is an issue others have encountered, I solved it by adding "-1" to the end of the files, a quick process in automator.
However this is annoying for the sake of timeline in the folder structure, and even more annoying when trying to maintain a logical, resonable and sensible structure.
Is it possible to increase the image counter to the 100,000 instead of 10,000? I've figured no in the cameras firmware itself, but how about 3rd party software?
Hope I made myself clear about the problem, it was hard putting it into words and I haven't found similar topics either here or on google at all. I also have a 1D MkIV that I will run into the same problems with over time.