J.S. I quench with vegetable oil, which does the same thing as linseed. Any parts left out of the quench, like the bolster, I rub with some of the quench oil and a rag as it cools, while the rest is still in the quench. About the time it all stops smoking and settles down is when I interrupt the quench and straighten the blade if needed, with gloves. The quenching does pop some patina off, but a little sanding over it evens it out. You could think of it as simultaneously quenching and burnt oil finishing.
I'm not sure if the tempering cycles/cycles would be hot enough for a good burnt oil finish, but I'll give it a try sometime.