JFK,
Let me explain what I try to accomplish. Here is the scenario: I have 20 videos for my show, I have 100 tasks, I use these 20 video in different tasks but all with the same resolution. I have a screen 10mx4m. I use scale tween and fit my videos to my screen. Somehow the client changed the screen size to 9.8mx4m. So in that case I have to go to the scale of all of the videos at all the tasks and rescale them one by one. If I had a chance to use a scale preset (like a media server) and use the scale preset for all my 20 videos, then I could just go to this scale preset and change the value to the new size then automatically all of the videos could be rescaled which I used that preset.
Is that clear now ?
Similar to having presets on lighting desks. Think that you have a huge cue list. You are using a color preset (which you stored before, for example amber color) in your 1.000 cues. Then the director comes and tell you he doesn't like amber, he wants red. Then you don't go to your 1.000 cues and change the amber to red one by one. You only update your amber color preset with red. Then all of your cues which use that preset becomes red.
Best regards.