So, I'm up to page 250 or so of the manual. Some component, LCA(?), of Toyota Safety Sense seems to want bare hands on the steering wheel, ie, no gloves. Would this preclude an aftermarket leather steering wheel cover, if you wanted the LCA and/or no warning buzzers/lights? My car will be a DL, without LCA, or steering wheel heat, lol. I found no other mention of the bare skin on wheel requirement for the other Safety Sense "features" the DL has. But I could be wrong. edit: On reading further of the chapter on Driving Support Systems, I sincerely hope that any of them can be persistently turned off if you don't have the need for it. If you paid attention to driving, you wouldn't need most of them.
I should think that any steering wheel cover would impair the capacitive touch sensors in the steering wheel.