Hi
I'm not sure how you are trying to do this, but assuming you have used the pan/zoom feature of VP, the format of the final frame at the end of the zoom/pan will be the same as the start frame. 16:9 or 4:3 depending on your setting.
I am assuming that you want the last frame of your film as a still image, so click your clip on the sequence line (best in storyboard mode) so your clip previews in the RH window.
Click near the end of your clip and then step along to the last frame OR use the lower of the two buttons on the right in your preview window. This will take you to the end of your clip.Now step back a frame using the upper button. The preview should now display the last frame. Now click the camera icon under the preview window to save the current frame as an image. It will appear on the media list.
This frame has the same format as the rest of the clip and can be added to your project in exactly the same way as an image. If you add it after your clip and then set the display for, say 5 seconds without a transition. Your clip will play..zoom/pan and then freeze for 5 seconds as the image plays.
Is that the effect you are after? If this is not the case, what do you mean by "scale".
Nat