I don't really know thats a good question ...

I doubt it. I never tried, that'll depend to the fanfic
moderators.

steet's the boss, you should listen to him...It should work
if you send GIF animations-(I'm just guessing, but you can
do so with Photoshop I think, or Jasc Animation Shop [a
really simple animation maker]).

Just save the
animation as GIF I myself don't see why it wouldn't work but
preview it on the site and if it works I guess send it? Or
something...

Not sure...Maybe you can send GIF images, I don't remember.
At least for the cover. You should be able to include any
type of pictures INSIDE the text.

Okay, just wondering.

No, I wouldn't think so. It has to be a still picture for it
to work, otherwise, I'm pretty sure it'd only show one frame
of the animation on the cover.