I know its easy to just hit ins but..
Sean,
When you have a lot of insertions of the same image, there's a little box with a number to set for Copies.
It's above the Thumbnails, to the right side or the thumbnails, and it says, Copies to Add. You can type in a number or hold the mouse on the little up or down arrow to set the amount.
Hope this is what you were looking for.
Fred