I just realized something
The Airborne Armaments set, sans the Liberty Launcher, is based around the knockback of a rocket launcher.
The Reserve Shooter is fairly obvious, the Soldier's method of putting targets in the air is his launchers
and the Market Gardener is based around rocket jumping, which is a mechanic caused entirely by rocket launcher knockback
A lot of people want to make the Liberty Launcher synergize well with the Reserve Shooter, and have it have something like "All knockback is strictly vertical", and I like that idea
But I think it could be better.
The Liberty Launcher
Level 25 Rocket Launcher
+30% knockback
All knockback on enemies is strictly vertical
-20% firerate
So we have a rocket launcher that allows for better mobility, and also synergizes with both of the other items in its set.
And here comes the part where all the smart people come out of the woodwork and tear my idea to shreds with their fancy pants "logic" and "decent sense of balance"