First off, my Renault Megane e-Tech has paddles that allow me to change the regen strength on the fly. I use it actively when driving.
But anyway, I find I drive differently with an EV. I don't let off the throttle unless I want to slow down. If I want to coast, I just reduce my throttle input to where its coasting.
Sure, lots of vehicles allow you to change the strength. Some allow you to set the regen very very low.
Generally they do not allow you to turn it off.