It shouldn't hurt if you added them in specifically on another day

maybe doing the "twists" you know .... using the 'indian rub' motion to lower and raise a weight (tied to a bar or broomstick or whatever), or getting some DB's or an EZ bar and laying your arms on your thighs with just your wrists hanging off and then "wrist curling" the bar or DB ....

the way it works with me, I don't really have to work them (as with calves) because they are worked well enough with my other excercises ..

but I like to shock em here and there so they don't get sloppy