Maybe I'm not understanding how this should work, so it might be intended, but when you have the "Apply bridging settings to perimeters", the bridging speed multiplier *overrides* the perimeter speed multiplier, it doesn't multiply the multipliers. Ie, if you have perimeter speed multiplier 50% and bridging speed multiplier 50%, you get... 50% for perimeters that are also bridging, not 25% as I had expected.
Also, the "unsupported area threshold" doesn't seem to be working right. Even if I set this to many hundreds of mm^2, I still get loops marked as "bridging" in the preview that are only a few mm long.