Persona emotes would be perfect for Dark Blast since that's basically what those actions did in their respective games, yet they aren't selectable as the activation emote for Dark Blast. I'd like to see more emotes being allowed to be used for the activation skill of Dark Blast.

So long as it's not the chair/pole dance...

From what I understand, the lobby actions that are available for dark blast and the victory display were only the free default ones and later added ones that you can earn in game (event badges, battle points, etc) + some from JP FUN scratches.

They do not include any AC or SG scratch lobby actions.