I'm finding the AT-AT moves far too fast and the AT-ST moves too slow. Is ther a way to slow the AT-AT's animations down in the ODF and to speed the AT-ST's up?

You will have to change the duration of the animations themselves as far as I know. I'm not aware of any "AnimationSpeed" ODF parameter.

I understand. I've never tinkered with animations before so I'l post any queries I have in the forum.

Just to make sure we're talking about the same thing, you're talking about the actual "quickness" of the walker legs movement, right? Not the movement speed of the entire vehicle?

Well, the animations don't affect the speed. I only noticed the issue when I recreated the TESB footstep sounds, hydraulics and all (some SWBFEA sounds were required but it's largely a mix of EAW and Soundboard clips). Speed of the vehicle itself is controlled by the ODF if I recall but that has no effect on animations if what you have told me is correct.

Exactly, but I just wanted to confirm that your problem is that the legs move too quickly/slowly compared the vehicle's overall motion.

To stretch/squish the animation keys uniformly, you'll want to go to the Animation Editor (hotkey 0) and select all the keyed parameters for every bone object (should just be rotation but maybe translation as well). Then select all of the keys in the graph view by dragging a box around them. Make sure you don't miss any, and make sure all of the keys from every curve are all selected. Then, depending which version of Softimage/XSI you're using, either type a value into the Sx field in the Animation Editor (e.g. 2.0 if you want the animation to take twice as long) or use the Stretch Keys tool (hotkey B) in the editor and drag from frame zero on the graph until the animation is the desired length.

Edit: I'm sure Ace has a better way of doing this but that's the way I know how to do it.