VI and Tactics sounds like the best combination, mostly because I am willing to have more games with Tactics's gameplay in different settings. The Opera House would be infinitely harder this time because now there would be stage directions and choreography.

More in the vein of Tactics, I would like to see Tactics Advance's Judge system placed in Final Fantasy IV. Cecil is a paladin, right? I think a code of conduct would have helped me believe that a little better. Besides, this game actually did have a similar kind of embargo when going to the Magnetic Cave. Talk about having to learn a workaround! Maybe Rosa could have been a Judge-in-training, to, I do not know, make her a little more useful. Pray could have been a rule switch command, while some enemies might have a similar command.