I really enjoyed the former summoner. It felt like I was performing an actual ritual that landed a big payout. That said I would actual be fine with the current setup if every action was a summon. I would love to see leviathan and think he would make a much better forward rush than Ifrit. I would like to see a Chocobo/Mog summon that mimicked the White Mage rescue ability. Shiva would be interesting as maybe an ice armor spell. I think phoenix should be made into the resurrection spell.

That said if nothing else, I would be really happy, and really appreciate some Summoner quests to unlock egi glamours and just be able to fully customize my summons.