Almost done ...

As soon as you realise that the DMA unit of the nintendo DS cannot manipulate whatever is on the stack because the stack (DTCM) is basically connected directly to the ARM9 cpu and therefore not accessible through the system bus, it gets easier to debug the rest of the code.
It required some cleanup and head-scratching, but at last I have thumbs for the frames rendered on the timeline and a similar thumb for each animation slot rendered on the upper screen. All I still need to get done for release 0.2 is now to allow multiple animations to be saved ... Oh, and I might also need to check that the sprite editor can manipulate the pixels of a .spr file without trashing the animations it contains.

errm. Wait ... I might need something to preview the animation as well ^^"