Hello Jiggy1965
Thank you for posting the issue on the forum.
Currently GWD supports x/y coordinates in keyframes by default settings so, when you create position animation, each keyframe holds translate3d(x,y,z) values.
One workaround I can think of to change the entire position animation is to change top and left positions in the css base style. You can do so by selecting the first keyframe of a layer, then from Properties Panel, change top and/or left values.
Please make sure to use the Properties Panel to move the object, not by actually moving the element on the stage with the selection tool.
This way, the entire position animation should be re-positioned based on the css base style "top" and/or "left" values.
Same way with scale animation, keyframes hold scale3d property by default, but if you change the Width and Height values in the css base style (by selecting the first keyframe, and change W/H in Properties Panel), you can change the entire scale animation without changing the keyframe x,y,z values.
Additionally, in the upcoming releases, selecting multiple keyframes and editing the properties all at once is allowed. This way, at least you can make bulk changes to multiple keyframes on a same layer.
Hope this helps,
Thanks,
Mariko - Google Web Designer