Consider the sentence "Conservative Party (is) Set to Win (a) Majority".
Is it right that "set" in this case is a subject-to-subject raising? I don't think "set" has an agent theta role. However, all tests show that it should be control: "be set to" does not admit expletives, and the meaning of idioms seems not to be preserved. (But I'm not a native speaker, so I may be mistaken on this.)