Different layer types

[Sentropic]

It'd be really useful to be able to select between different types of layers, like:

• 8 bit (allows transparency but only one color)
• 1 bit (allows only one color and no transparency)
• Multiply
• Stencil
• 32 bits (the regular one, that allows any colors and transparency)

[4194304]

I think that there should be more types of layers in addition to what you said:
Additive (adds colors together)
Hue (All hue values on that layer get overlayed on the layer below it)
Color (Uses coloring and brightness to give the image the other image's color)
and Brightness/Luminosity (Uses brightness values to give the image the same brightness values as the other image for the colors)