It's mostly identical to Lineage's kernel in regards to the device features, there's only some security updates and optimizations, so if you have any problem on stock lineage that isn't the charging over USB when connected to a PC (that one was fixed a while ago), it most likely will still happen here.with the official kernel in LOS 18.1 stereo sound for video recording is not working. I'm not sure if that is related to kernel, is it? I was notifying that sound was getting too loud when using hifi DAC. Low sound with audio recording. I have to set 400% in AudioRecorder (downloadable in f-droid.org) and yet it's weak. AFAIK for IR this kernel still has a problem with time lag after each shot and It does not add FM radio support, does it?
That audio problem could very well be kernel related for all i know, but will probably be something on the kernel-side device tree files and might require a lot o refactoring to achieve. Personally i don't think it's worth the hassle on 3.18.