It's actually all in the subject: When using Go's very convenient delay package, can I still upload a queue.yaml file and configure the limits etc. for the "built-in" queue? If so, is the queue name simply "delay"? Do any other restrictions apply?
Haven't tried this myself, but this page says:
The default queue is preconfigured with a throughput rate of 5 task invocations per second. If you want to change the preconfigured settings, simply define a queue named default in queue.yaml.