Hi Laura - I never knew about the shortcut! But, I still post pictures from both imagestation and photobucket. I resize all my pictures to 500 pixel width before I upload them.
For imagestation, I rightclick and highlight the properties and paste them into a post between IMG tags.
For photobucket, I just copy the bottom box and paste them directly because they are already 500 pixels wide and photobucket already has the IMG tags in that bottom box.
Does this help???
Maybe it is not what you were asking - not sure...