I would avoid boiling them, as cooking fruit causes the pectins to gel up, and can cause a haze that just never quite goes away. If you wanted to heat them, I would pasteurize them by keeping them at a low simmer of 160 - 170F for about 15-20 minutes. This should be enough to kill anything in the fruit, but not enough to turn your raspberries to jam. If you were extra-worried about haze, you can use some pectic enzyme as a precaution.
When I used them, I pasteurized them and threw fresh raspberries in secondary, not primary. This preserves a bit more of the original fruit flavor, as opposed to actually fermenting the fruit in primary. I'm sure plenty of people have had success with them in primary, though.