All patron categories are renewable in Koha. Once a patron has expired, the staff can easily renew this patron. A library has a scenario that would like Koha to not allow a specific patron category from being renewed. This patron category is temporary and they would like to have staff not have the option to renew them.
We really would like this for Temporary card patrons, they don't yet have good proof of address or have lost their ID. We would give them time to return and rectify the situation. But if they don't return in 6 months we would like to not have that "easy click" to renew them. We would like them to expire quietly.