You generally don't need to hit the gas hard to merge onto a freeway, you need to accelerate evenly on the ramp and be at 65-70 by the time you get to the merge point, being aware of traffic and where the gap is that you're going to merge into, and hitting it.

And occasionally having to hit the gas or brake hard is not going to raise your rate. They look for more of a pattern than that. If you're always braking hard and then accellerating hard, surging and changing lanes, consistently speeding, etc. that's going to be the trigger and what do you know, that's also the kind of driving that causes crashes.