You could specify memory base, stride, width, height, and choose number and order of channels and see a visualization of your memory. Also a button to copy the image to clipboard would be useful, too. I think an image viewer would be a good selling point for the debugger, and would make those moments where your texture is all noisy and weird much less frustrating to debug. Thanks!
-EDIT: Now I realise maybe that's a bit too specific of a feature, but hey, asking is free.