I often burn things on a CD-RW and leave to do something else while it's burning. When I come back, I often find a dialog asking if I want to erase the CD. 

Well, thank you for asking, but I would prefer if n-c-b would have asked me before the lengthy image creation step. Each time, while it creates the image, I start doing something else, and forget that I must keep looking at that image creation dialog that takes forever to complete, until the image is created. It never happens, as I leave, or start doing something else on another virtual desktop. When I think it's finished, return there to see the confirmation dialog greeting me, meaning that n-c-b didn't even start to burn the damn thing.


Steps to reproduce:
1. put a rewritable medium (CD-RW) in your CD burner
2. try to burn a big CD or DVD.
3. see how slow the image creation is, so slow that you leave to do something else, but still thinking that the files will be burned.
4. come back a few minutes later thinking that the operation is complete, and see that n-c-b asks you if you want to erase the media.

Possible solutions: 
1. on-the fly burning (no image)
2. ask the user if he wants to erase the CD *before* the image creation, as it was done in older n-c-b versions (best solution for me).
3. kill myself