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Yes, I see no harm in reving them. Going up and down in rpm is not the thing that damage it is the time it is in top rpm and held there. Flipping throttle is a good thing on any saw. After a couple heavy cuts frlipping throttle cool them of, Idle make them hotter for a bit after. No rpm=No...

I have yet to see a saw that needs to be broken in. Just run them as you rented them with two exceptions. Don't do high revs without load a lot and don't run it hot. Ever, that applies for all saws any age, brand or model.

Problem with fresh air saws is in the engine type.

This is possible if you like to try. Just open winter lid up and it gets hot air from engine in to air filter area. Works well when it is really cold. Cooks the saw when it is warm.