Basic feintable heavy attacks in combo or not: Double press of the heavy attack button so that if the second press is inside the current allotted cancel time the attack is feinted.
Chargable feintable heavy attacks: After releasing the charge up and pressing heavy attack again the attack is feinted.
Chargable and feintable bashes like Wardens shoulder bash: Pressing heavy attack while charging the bash cancels it.
This option would make playing the feint game less of a hassle with a basic controller.