A patch release can be small (a single patch) or large (a service pack including several patches). Regardless of size, you will need to set a release for the patch.
A single patch might have a name like toolkit/3.0patch, while a service pack-size release might have a name like toolkit/2.0sp1.
Identify which purposes will be used for the patch release. Typically you will need only Collaborative Development and System Testing.