Would greatly speed workflow to be able - not only to drag images onto objects - but to drag different image / textures onto different sides of an object - a cube, for example - and be able to scale / rotate the image/texture to fit.

I know exactly what you're talking about, and I've been wanting to make a tutorial/educational video sharing what I learned, but I'm simply not getting around to doing it.

Briefly, the issue that is even on a cube, each side is not associated with a separate texture.

Take a cereal box, cut along the edges and unfold it and lay it out flat on your kitchen table.  Now draw a large square around it.  That ONE square is the texture map for what is actually a six-sided cereal box.

And that, in a couple of sentences, is the essence of UV maps and unwrapping.

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iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD

There are "wall" props available that have a different map for each side. You can scale these into a cube shape.

You can make your own "cube" in sketchup and apply a different color or image to each side, then import into iclone with a different texture for each side.

Lastly, using planes, you can create your own cube inside iclone and attach/merge the planes to form a single object. Load each plane from the content panel (do not use multi duplicate), and assign a texture to each side.

When you merge the prop, you will be able to load a new texture to each side and adjust independently of each other side.

There are certain advantages in having a single texture for multiple sides with respect to previewing and rendering efficiency.

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Yes, I get that. It's why we have sprite sheets for Flash games, and so forth. Still, from a designer's perspective, it's a desirable feature.

DAZ has a Texture Atlas tool, which allows you to combine multiple textures for an object into one.

If iClone or 3DXchange had something like that you could design your textures with ease and then combine them later for efficiency.

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