Currently the plugin only allows claiming a build or test for yourself. It would be very helpful to also allow assigning a build to another user. For example, when working on a team of a few people, only one of us needs to check unstable builds and then assign out builds/tests to the team members.
I've attached a patch with an initial implementation. It adds "assign" and "reassign" buttons on the UI, bringing up the same form but with an extra field for the target username. An email is sent to the assignee when he is not the user claiming the build for himself.