I don't know what Gimp version was used by Megacycle, but Gimp is definitely not the program I would recommend. If you can, find a torrent for Adobe Photoshop CS3. It's the easiest one to install and crack, and unless you're using it commercially, no one will care. I also assume you mean scanner, or that your printer has a built in scanner...
As for fixing the issue, it seems that if I turn on 'dispose', the animation will play properly in Internet Explorer (rather than be very laggy) but it will still play stupidly in Chrome or Firefox on a Win7 machine. I'm fairly certain that WinXP does fine regardless of browser, but I'll switch the Master to automatically use 'dispose' (look it up, it's a weird option regarding transparency, even when transparency is not used)
And, so far no one has tried creating or editing frames except for me. Someone else might be fiddling with it, but there's nothing yet. Mostly it'll consist of editing existing frames to give new branch points. Creating the sequences tends to be fairly easy, though even having decoded the old one, I'm still not very good at getting the timing 'just right'.
Infranview works moderately well at regulating the speed, but I think that one still plays it a little fast. You can at least zoom in with it. And on Internet Explorer, you can also zoom. If I had the right addons, I could possibly export as a Flash animation, but I don't think I can.