I do not own X/Y or a 3DS, nor do I own Cyber Save Editor. All of the things I add are based off of the research of others (who I usually advise on what/how to look).
If the community wanted it displayed in index numbers instead of bytes, they'd have to figure out what byte sets what, just like every other feature. They would then have to report back with a feature request and the necessary info on how to implement it.
Since I do not know what bytes set what, PKHeX just displays the raw bytes and the rest is left to the user.