I don't have access to a device with a decent screen size at the moment, so I don't think I can support with a review. But do we want the strict mode only to be adjustable in __init__ and not in the class methods? This is only me asking without totally knowing the context.

@lumagi Super fast reply after two months:
My thinking was: Whenever the user provides the timings, we give him the option to relax the requirements. But whenever python-can suggests the bit timings, they should be inside the minimum required bit timing ranges for best compatibility.

I added the parameter to a few classmethods in my last commits.