Of course, controllers will work with any situation as the need arises especially if someone needs help. That goes without saying. AND, we will decipher anything we need to to help anyone we need to.
But that's not the point of the question, is it. The point is not whether a request for "delay vectors" can not be INTERPRETED by the controller into some meaningful concept. It is always better for a pilot to speak clearly and express his request clearly and with as close to "standard" words and phrases as possible rather than relying on the controller to try to understand what you are asking for. In fact, I would ask exactly what you want anyway...so the so called "plain English" request for "delay vectors" with nothing else will likely lead to more conversation, not a reduction of conversation. The point is what is the better way, since we are trying to improve.
My experienced opinion is exactly what I posted earlier and for the reasons given. And every GA pilot should rise to the level of professionalism required for the environment they intend to play in. There is no acceptable level mediocrity in this business so the OP asks a very good question about recommended methods, because clarity is always best.
I may have a 737 on a ten mile final, a c421 behind him, a simultaneous arrive to the crossing runway and two spots to put you in, one of which is rapidly disappearing. I need something more than "delay vector". I need to be let in on the plan.
tex