WowAce

Is it possible to add the option for shoiwing the spell queue window as part of the player castbar and maybe even the GCD timer?

The Latency help to figure out if you can still interrupt the cast, but the spell queue window allows to check when the next spell can be queued, which is quite helpful when trying to minmax dps. And since the value is readily available through "CVar SpellQueueWindow" it should be easy enough to add it to the end of the castbar similar to how Latency is handled.