Email validation off setting for old members

[Owdy]

Currently, if i set email validation for new members, it sets it to old members too. Id like to have setting where i can set this only to new members. Why, because now if old members changes email and he is some secondary group, his primary group changes to "Valditation" -group but it doesnt have any affect because his secondary group overrides that setting. So that member just wonders why his group name changes but nothing else happends. So IMO this is totally useless and confusing feature to old members.