So, apparently having happy ghasts floating freely around causes a bug that slows down events like falling objects, breaking items or even shooting an arrow. But that can be avoided by parking the ghast in a minecart. Which also works to easily ride it without having to chase it or carry snowballs. And to release it, an activator rail will kick out the ghast.

Well, point is does anyone have decent ideas to build something like pic related? I love the idea of having a ghast parked in a wagon, ride it, push a button and get expelled into the air. Then turn around to park back into a fresh wagon.