It’s nice to see that you’re finding the Nano useful for field work.
The idea with the current scheme is to get creative with numbers. One example would be to dedicate a range of numbers to specific measuring tasks. This could be ignition 100, injection 200 and so forth. Waveforms and matching profiles would then share the same sequence number or you may opt to use a single profile for a series of reference waveforms (e.g. profile 100 is good for waveforms 100 to 110 and so on).
I’m afraid a file manager type feature might obscure the user interface and become more of a curiosity (meaning - yes it is possible, but …) than an appreciated feature. Still it may be a good enhancement to allow alpha characters in file names. We would then use our computers to assign more meaningful names (8 characters + extension) to files.