Have Role permission to allow users to import leads using “Skip new people and updates” List Import Mode ONLY

We want to give users permission to be able to import leads but we ONLY want these users to be able to import leads using “Skip new people and updates” List Import Mode ONLY.

i.e. we don't want to give them permission to import leads using “Default” List Import Mode as we don't want them to be able to import new leads.

Would be awesome if user Role permissions could be configured to do this