How to predefine a filtering bias?

[AfromD]

I am trying to make an IMU as robust as possible in a high vibration environment. Therefore, I expect acceleration sensor data to be least reliable, and I would like the filters to rely on magnetic sensors most, gyro sensors second, and least of all acceleration sensors.

Is there any place in the code where I can influence this? I have read through all the comments and found no such thing.