I don't think CP brakes their coasters very much at all. The only coaster at CP that has bad trim brakes is Mean Streak. Most of the other coasters run pretty much wide open, or have light trim braking at the blocks, but that doesn't affect the ride very much. Mantis and Magnum are exceptions. On Mantis, the trim brake actually made the ride better IMHO, because you now get some hang time in the first two inversions and the rest of the ride is not as physically demanding. Magnum's brake going into the pretzel usually has very little effect on the airtime on the return run, and was probably put in place for structural reasons. Monty Jasper's comments during coaster mania were very encouraging. He said "Believe me, I wouldn't put brakes on a ride unless it really needed it". Which is pretty much how I felt that CP ran the rides. I wouldn't worry about Shivering Timbers, if the structure is holding up well than I feel very confident trim brakes will not be added.