The only way to change the file numbers to a manual setting is to start with a clean formatted card then shoot a video clip (5 seconds or so), after you have done that you take your card to your computer load it up and rename the file to the number you want (keeping in mind you have to stick to their file format exactly i.e. MVI_XXXX.mov so you would change XXXX to something like 1000 depending on what system you want to follow such as camera one starts with 1, camera 2 starts with 2 etc) and you will have to keep doing this every time which can be a pain in the ass, but as far as I know it's the only way to force a custom number system.
