I would appreciate that.
Even if i wasn't a shy guy, i would appreciate that. This way a boy may become a aware of the girl or of her interest in him when otherwise he may have "missed" that.

Even if the boy makes the first move, I'd still ask him for his number (rather than giving him mine, if he asks for mine). Too many boys say they'll call the girl and then they don't.

I wouldn’t mind at all and why should I? The only thing that keeps stereotypes going is wanting to play into them. If a girl likes me enough to flirt with me and ask for my number I’d be happy to give it to her.