Maybe more off road type tires than what comes on it. I run 1/8 buggy wheels/tires with adapters, but there are quite a few more agressive tread tires out there for the stock wheels.
I'd seek out a more stout roll bar or at least a rear wing. Especially with the 3.3 as it's so tall. One bad roof landing and you can kiss your crank case good bye.
Also, you can make a plate (or buy something) to tie the tops of the two inner/upper tie rod ends together to make it more stout. I made a steel plate for mine and never had a problem:
Huh, new era makes a few things I'd suggest... and should probably just buy myself so I have proper fitment:
Front brace noted above:
http://www.neweramodels.com/item.cgi?session_id=&part_id=9410
Rear brace for the same thing but on the rear:
http://www.neweramodels.com/item.cgi?session_id=&part_id=9411
Made one of those out of steel as well... doesn't look as nice as new era's though. I busted the ears off the trans while cartwheeling.
And an upper tray brace:
http://www.neweramodels.com/item.cgi?session_id=&part_id=3050
I busted my upper tray once... made a steel plate for that too.
I'd also suggest RPM arms. I never ran stock arms, but I've beat the living snot out of my jato and the only thing I keep breaking is crank cases from too big of air and it slapping the ground so hard. Had to stiffen up my oil and springs to hopefully avoid busting another next year... so far I've busted 4.
You may want to investigate a spring mounted header as well. I use an associated on-road header that I had to mangle/tweak to fit, but the stock one fails like the revo ones do. When you land hard, the shock cracks the header right where it bolts to the engine, then your day is done.
Almost forgot, an RPM front bumper is almost a requirement as well. However, I found that it turns the jato into a bit of a lawn dart, but it does help protect the front end more than the stock one. There's another company that makes one I'll probably buy that curves up more. If I find it again, I'll post the link so you have it.
EDIT:
Found it, it's t-bone racing:
http://www.t-bone-racing.com/catalog/i246.html
That will be the one I buy next when I bust my RPM one... I'm on my second RPM bumper.