No.
I've been told go deeper while fukking and it's because I'm very aware of not fukking up the momentum by hurting her cervix(that's not fun for her.)
So, while trying to gauge, I'm stroking on some medium range shyt and go deeper is the green light to...
Go deeper. I tend to switch the tempo up as well and slow stroke when she's ready for the long dikk. Still have to be conscious of her enjoyment. Anti-climactic, but it's the truth.
Women know what a small dikk looks and feels like. Unless she is a callous soul destroying Savage...I doubt a woman would intentionally say, "go deeper!!!" to a nikka with a small dikk.
It's like 1990's Pat Riley yelling
"SHOOT THE 3!!!" to Alonzo Mourning.
Why would he intentionally make him go outside his apparent skillset?
-------------------
I'm looking at the other comments in this thread; interesting.
In my experience, it's literally the parallel to how we dirty talk her if she's giving immaculate head.
Jawn 1: She is a beast. Sucking the dikk, eye contact until she really gets into it and closes her eyes like she's about to go super Saiyan. Sloppy as fukk and going from deep throating to sucking on the head and spitting on it.
I'll be saying all types of dirty shyt, like, "Yes... suck that dikk. Nah, you sucking it like you don't want it. *Takes dikk out of her mouth* tell me you want this shyt. Now, make that shyt sloppy, you too proper with it. Make that shyt sloppy!"
^All of that would only be said if she was really giving me some Mastermind brain...
If it was jawn 2, below...
Jawn 2: She...she's trying; bless her effort. But she's too clean with it, kind of boring. She looks at giving head as a chore more than an art. She loses concentration at points and makes a mistake and uses teeth. 
I'd be just giving the obligatory sounds of satisfaction meanwhile thinking about some shyt to make it more arousing and pleasurable.
I wouldn't hurt her feelings by giving her a real time critique about her dikk sucking needing to be adjusted.