The current pre-commit hook for Subversion only checks the existance of a valid JIRA issue key.
I believe it should also check if the issue is in "In Progress" state (or in a specified state for custom workflows) and if it is assigned to the committee, i.e. a developer should only commit to his current tasks.
I realize, not everyone would want this, so it should be configurable in the administration page, same place where this hook can be enabled/disabled.