Probably not. Since we don't have user accounts, and already have a bit of a spam problem, I'd be pretty worried about what a real POST API might bring.
Pipes/YQL seems not to have been banned yet, so getting 4chan data back wrapped in a callback for nothing-but-front-end hacks seems doable. Also along those lines: it'd be super-awesome if the API would take ifModifiedSince as a query parameter and not just in headers.