You need to make rocket items yourself.
Okay so you take the rocket projectile model found in the default blockland files.
And turn it into a item you can pick up.
Easy 5 minutes of work.
Also weapons that already use an ammo system will be thoroughly broken
If I were using weapons that already have ammo support then chances are I probably wouldn't be using the universal ammo script to begin with.
But I'm not, I'm using weapons that do not have built in ammo support.
So I don't honestly care if it breaks stuff I'm not going to use like tier + tactical.
This is also easier on add-on makers because now they don't need to make their own ammo systems and they don't need to make sure if their ammo system is compatible with T+T or whatever.