Sorry, GIFs are not supported due to patent issues (although I think the patent may have expired...).
If there is demand for this, I could add multiple frames for icons, with each frame being a separate image... I would have to support a frame rate and a loop setting for each icon. Hmm. This probably wouldn't be terribly difficult to do if each frame was a separate image. For loop settings, I guess it would be best to support a mode (forward or forward and back) and a loop count (number of times to loop or infinite). These would replace the OnImage and OffImage, so the settings could be different for each, and if it was mapped to MSG_START it would just run forever. Is there demand for this? Is that a silly question?
--Chris