Not to change the subject but the mystery of who invented sampled legato is much like the mystery of who came up with the concept of MIDI.
It really is time for an update to the MIDI spec, but I think that we're just so far down the rabbit hole with current offerings that change would be really difficult. Yamaha invented a sort of update with their XP format, but it still used the old limited version. There are various new sorts, but nothing seems to be moving on that front.
DG