Our atmos system used to work like this years ago, we used a different atmos system called 'ZAS' (Zone area simulation).
It featured exactly what you're looking for--explosive decompression, objects and people being flung about mercilessly.
As fun as it was, however, it also came with a slew of bugs. We eventually moved onto the LINDA system (no idea what that stands for), and while we did have someone code in a sort of explosive decompression thing for a bit that worked alongside it, it came along with its own issues, enough that we eventually removed it as well.
I so badly wish we still had ZAS--but there were legitimate reasons for switching over to LINDA. I don't expect we'll be able to do anything to change our system anytime soon, although it is something I feel the game does need. Space should be deadly.