A feature to create a data cd/dvd would be great. What I love about imgburn is its simplicity. It's not bloatware like nero. If you've tried nero7, you will really understand the use of the word "bloat"
If mr lightningUK were to add this feature, there is a few things I think would be important.
1. Stay simple, only open some sort of extra window for adding files if needed. A good suggestion for such a window would be someting that resembled a filemanager like totalcommander. Of course a VERY simple one with functions like copy/makedir. Idea would be to "copy" files over to a virtual drive, and then press burn. I think this would be the easiest and most effective way of creating your cd/dvd structure.
2. Stay simple. Yes I know I already mentioned this, but it's very important.
At the end I just want to thank LightningUK for making such excellent software. dvddec, and now imgburn, is always one of the first things I install. It's stable, easy to use, doesn't drink memory like a raving lunatic and doesn't mess up anything.
I am hoping that in the future, more programmers will realize that there is a need for speed/effectiveness instead of lots of fancy crap noone uses. I hope one day I will be able to ditch all the burning bloat and have 1 small, effective program that suits all my needs.