@Phynix - In the normal gradient options you can choose the gradient to go between the two endpoint colours around the hue, or directly. This might be respected in the gradient map (sorry, no gimp handy today).

@Nolgroth - If you don't have all the channels selected anything you do will only apply to the selected channel. I.E. if only blue is selected and you fill with a pattern, it will only fill the blue component, even once all channels are selected later. Useful for a few things, annoying for most other if you de-select one channel unintentionally

-Rob A>