Suppose a charity is providing free legal services as part of serving their charity's mission. Can the charity make these services contingent on a contractual promise that the plaintiff will not settle without the charity's permission? A cash settlement might be missing things the charity cares about (public record of the defendant's wrongdoing, promise of changed behavior, etc.) This result is frustrating for the charity; the charity's reason for providing free legal services was not to make money on contingency.
Clarification: The intent of such a contract would be to block a plaintiff from accepting a settlement offer without the charity's permission. It would not prevent the plaintiff from withdrawing entirely.
Note: Responses corresponding to other jurisdictions are welcome.