Question about air pressure, air tanks

I am completely new to air rifles I had only done a little research. From what I can gather how they get stronger and faster is just making the one thing better like make more pressure that comes out of the air tank. What about if it was being custom made to have more than one valve open up customise it so 2 (or more)air tanks are on the gun and it releases both at the same time either both blow the air out at the same spot or have the first one blow from original position then the 2nd one blow a bit further up the barrel and give the pellet a boost.

Just a thought, have no idea whether the 2nd one would even be fast enough or stuff it up, don't know that's why I'm asking you guys if you got any idea