s? (this is because I couldn't type any more in the subject line)

I did a mask and I forgot to set the feather in the first keyframe, so all the rest of the keyframes forward stayed the same way. I thought it would be as easy as selecting all the keyframes and setting the feather, but even if they are all selected, the feather I set is only applied to the current keyframe. Is there a way to apply it to all of them at once? I have about 40 keyframes, I don't want to waste time going one by one.

Thanks