Exporting PNG sequences is now implimented, importing them still needs to be worked on. Animated gif stuff is proving to be a bit of a pain, but I haven't given up just yet.. I'd like to at least be able to save as GIF if only so it's easy to show off effects easily on twitter etc.
The output scale only affects the exported image, so it's not noticeable in the demo version. I should probably make it a bit clearer.
I'll think about the individual emitter effects a bit more, but I can think of quite a few technical issues that could well get in the way. In the mean time, if you add palette colours that are close to the colour ranges each effect uses, then you can still achieve the effect you want. The provided explosion examples (in Examples.zip) show fire + smoke in this way :)