I read it quickly so I'm not sure if this covers all your questions:

Editing animations
1. Import a model

2. Import a valid animation (ie do not try to import a slinger animation for a pike model)

3. Edit animation.

4. Export animation. The tool only looks at the translation and rotation of the bones. How the mesh looks like does not matter.

Since I am able to translate bones, I guess that scaling is not a problem.