Yes I know the devs have said they won't but they've done other things they've said no to.
Seems every other shotgun thread is down, so
They don't have to be unbalanced, either under or overpowered, they can simply be made say 2 hits to kill and semi auto with relatively tight spread.
Would be more realistic that way anyways, most military use shotguns nowadays are semi auto and the heavy gear worn by BBR's characters would slow pellets down a bit.
It'd freshen the game and slow down cqc a little, there's clear demand. Just do it.