[Koha] Deny staff patrons permission to check in items issued to them.

Hello team, Our library staff are allowed to borrow upto 5 items. Either junior books or adult books.  We are looking for setting in koha that only allows the chief librarian  ability to checkin or checkout items to the staff patrons and deny any other staff from doing it. We also want to ensure that  staff donot checkin items issued to them. We also are in the process of introducing a new item type- Laptops and tablets and would like them issued by a particular staff e.g. I.T. clerk. How can we set this in koha?. We are using koha version 17.05 Someone please help. Warm regards. James