[Tracking] Remove specific frames from sequence?

Lets say that i have loaded 100 frames into the movie clip editor for 2d stabilization.

If i then track the first 50 frames and then realize that frame 51-55 is way to shaky(the autoscale will crop to much of the video because of it)

Can i then remove these frames from the sequence without having to retrack all previous ones? If yes,how?