Looks like linking to youtube is down...
Try this: https:// www.youtube.com/watch?v=D-wlMYYwisw
Since the cropped sensor is only using the inner part of the lens, it should only use the inner part of the polarizer as well.
Therefore, in my mind it would be comparable to a longer focal length.
Question though is how severe the effect is and can it be avoided/compensated for at the wide end. At the end of the day the effect is real, up to you if you think it is acceptable or not. Probably as long as you dont go completely wide, so use from 16-18mm or longer then you will be fine. Then just use with caution when at wide end.
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