You can normalize the volume of all songs using audio editing software like Audacity or a batch processor. This will ensure consistent volume across all tracks.
Can you use that during live gig? 
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From a programming perspective it probably wouldnât be too big a deal. If you applied a 5% bias to a song in the BBMO it would just increase the velocities across that song. Apps like Audacity have no issues with this.
What you suggest isnât a big deal, but then youâd need to duplicate each song for each set list where you want to have different volume 
Another issue could be the usage of velocities which is not identical to volume (itâs related but not the same)
Anyway, I feel that there are multiple wants, needs and ideas floating around and around in this thread. Additionally, communicating those things is difficult so I think SS will just make their decision one way or the other 
Best way is to make a feature request and hope for the best 
Your first statement is exactly what I would like.
I only mention velocity as this is the suggested method of changing volume by SS. But currently you have to go and change every hit individually.
They could also apply a bias on the pedal volume for the song.
Lots of options depending on the actual code.