Scheduling over-limit requests #172

Is there any way to schedule currently over-limit requests?

e.g. I send a request that I want to happen eventually, but the rate limit has currently been reached.
The service could add the request to a queue and then return the success response once the rate limit allows.
This could also take a timeout parameter for the individual request. As the service can calculate when it will resolve the request (from the queue size and rate limit), it can reject immediately if it won't be resolved within the timeout.
This means the requester will know that the request will be handled eventually within the timeout, or will get an immediate rejection if not.