Well I think it is a issue when a member has a problem with registration and gets deleted within 24 hours. I think that is to short a duration.
Rick stated something will be placed in V8. Hopefully it will be a option to set a time limit ourselves like 0 to not delete or 24,48,72 hours to self delete. That way it keeps us all happy campers.
Of course in the meantime we could hack it in.