RE: Won't roll!
That airplane was designed for only one purpose and that is the most basic primary training. It is intended to be highly stabile and resist any upset, It will never be an aerobat.
It has excessive dihedral among other things that is intended to increase roll stability which of course will decrease roll rate when ailerons are used.
Interestingly enough if it used a rudder and no ailerons this higher dihedral has a tendency to increase roll rate.
John