Of course having an option like that is possible, if you don't check it however, and then export a batch of render targets where all names are not unique, you will end up overwriting one or more of them which could be pretty annoying. The numbers guarantee that file names are unique regardless of what silly things a user might instruct the software to do. It is also faily easy for you to remove the number appended to the file name in the script.
I have another question, should there be an option to ignore the max samples value if a kernal node is attatched to the render target, this way you could do differnt numbers of samples depending on what type of kernal is being used.
I think it would be great to have an override. For example info channels kernels in the batch don't need all that many samples to converge.