Hi and thanks for your comment. When designing Onion Packer we focused on the designer need of:
- quickly finding the right texture / image
- have a fast way to preview it on a 3D model
You mentioned bumps, which is something that is in our roadmap (3D preview, together with diffuse textures).
We are looking for precious feedbacks and testers, since we are in the initial phase. If you have some good suggestions it is very easy that it will be considered. Onion Packer wants to take the direction that its users suggest it to go :)
Give it a try, it's totally free.