Get a manual ;) The amount of toe isn't too bad, I've certainly had a lot of fun with it. That said, of course its not a V6 or anything like that so no, it's not like when you put your foot down there's a lot there. But I can certainly manipulate the gears enough to give it a fair push - ask the guys on some of the cruises I've lead whether the pace has been quick enough for them
Suspension wise, the Gen 6 Sportivo definitely has a different set-up to the other models, I'm running 18" wheels and I have also purchased an upgraded front and rear sway bar, the difference over stock is remarkable. So much better through corners/roundabouts etc I feel safer for everyday driving too, where I point the nose the rear follows. And it's still pretty comfy too.
Performance wise, exhaust and CAI would make minor gains, but unless you go down the path of supercharging/turbocharging there isn't much to be gained there. Personally am looking at exhaust next, just so when I put my foot down it doesn't sound like a standard Camry getting revved (though I don't want anything stupidly loud either)