Hi,
I wonder about the question.
Isn't it well defined in the RS485 standard? Isn't it well defined in internet sources like wikipedia?
You are looking for someone to tell you that it works beyond the specifications.
For sure many people may have tested it using single stranded cables...maybe with good results.
My example:
You go climbing, your weight is 80kg, but the rope you have is specified for 70kg only.
Would you ask if someone has tested the same rope with 80kgs?
And if you find someone who has tested it with good results...would you rely on that?
--> My recommendation: keep on the specifications.
Klaus