I posted another quickie for reference if people are interested.
The scenario and the problem I had was this :
Say you have a bunch of images which are 3X4 aspect ratio but they are not all of the same size
If you have a border action which creates an image by adding 'x' amount of pixels, then the smaller images ( if original cropped) will have a seemingly larger border whereas larger images (eg panoramas stitched) will have seemingly tiny borders.
I hope the video answers how to keep the borders proportioned to the image:
(youtube link also because people on facebook requested it lol http://www.youtube.com/watch?v=Wo-H0SVZK60)