SE, don't overthink Summoner 7.0. Just give people what they want. Just do it.

[Renathras]

I wouldn't have the pet attack automatically, for the simple fact that it takes up space in its queue, so then all commands would have a delay.

I wonder, could this be solved by making the attack an instant? Like SCH's Ruin 2, for example. Code its other abilities as oGCDs. That would solve this problem entirely, wouldn't it?

Like get on SCH and put a dipping bird on your Ruin 2 key so it's pressed every GCD (or just spam that button while you're doing...), then hit your oGCDs (Protraction, Aetherflow abilities, etc). The game's quing system tends to fire them off immediately after an instant cast spell. The spacing then would only be the animation lock of the oGCDs themselves, which isn't any worse than using oGCDs that come from your character, so it seems like that should workout the problem.