Not sure whether this has been requested already, but, how about the ability to edit an iso file directly ie delete or add files etc.
I used to use Nero for all writing tasks, suffice to say ImgBurn is basically the "Dogs B****x" and is now my burning app of choice.
However, yesterday I had the need to edit an ISO I already had; I only needed to add one file, but the iso was bootable and I did not want to have to go through the hassle of burning/mounting etc just to recreate the ISO with an additional file.
I believe this would be a very useful addition to an already Excellent Application.