Resolved but not closed incidents.

We often mark incidents as resolved but not closed as we sometimes have to wait for testing to be carried out at a later date or for a new release which could take some time. Is there a way we can Mark the incident as resolved and have the SLA clock stop? We have incidents that have been resolved before the resolve by date but it may be a month or 2 before a new release which means the Resolution date passes and fails. We would like to not close these incidents as we would like to keep them visible for follow up.