Wait the OP is serious? really? okay

From both a tank and a healers pov, I can not support this idea. As a healer it would trivialize the role to becoming how fast can I cycle my healing. As a tank anything that makes your job a lazy one is bad as it reduces you watching what you are doing.
The Regen thing can by a royal pain if the tank is on a controller as I understand they have problems swiftly navigating the ui, and other players in roulettes and DF are always in a hurry and tend to get mouthy if you are not pulling fast enough. but it is manageable on both sides of the equation if the healer is alert and or the tank see that the healer is relying on regen heavily.