Nope, not really. I think the rear bar balances the car pretty well. If you're wanting better handling yet, I would look into new springs or coilovers and new tires. I think if you tighten things up too much farther it'll start being uncomfortable for a street car.
I'm not sure you were around for it, but a while back I did test weather a front strut bar would be useful on these cars. Spoiler alert, it isn't.
Testing: strut tower movement
Its possible a rear strut bar may be useful, but it would be difficult to make one that is trunk use friendly.
__________________________________________
View my fuel log 2015 Mirage DE 1.2 manual: 47.2 mpg (US) ... 20.1 km/L ... 5.0 L/100 km ... 56.7 mpg (Imp)