The default setting of "1" for smoothness is becoming one of my biggest peeves with Vegas. I can't tell you how many times I forget to set it to 0 only to have to go back and reset every keyframe after I notice that black edge creeping in on tight moves. I thought I read in an old post that there is no way to change this default. True? Also, I thought I read way back when, that there is a script that might reset all smoothness flags in a range or event to zero?