Generally companies like people with "big ideas" and how you would improve things if you were given the opportunity, so lay that kind of stuff on thick. Also in most companies pay is related to job title so by encouraging you to move roles your manager might actually already be paving the way for you get a rise.

Depending on how big your balls are you could also play the in-demand card a little by letting them catch you surfing a jobs website occasionally, dont hold me responsible for the outcome of that one though.