"Merge Objects" - Annoying behaviors

There are three things that Merge Objects does which could be improved.

1. The resulting merged object will not have a Mesh Collider. Any component, it seems, other than the Mesh Renderer, will be lost.
2. The merged object will lose the Layer and Tag properties of the merged parts.
3. The merged object will lose its transform parent. That is, it gets moved to the root of the scene, instead of being in whatever game object the merged objects were in.

I could understand any of the following if the pieces being merged had distinct values for these attributes. But I almost always merge objects that all have Mesh Colliders, all have the same Tags and Layers, and all have the same parent. In those cases, I would expect that the merge tool could preserve qualities the various objects have on common.

Thanks.