[NaS]

You can do quite a lot with attached objects, don't forget about that.
Also many cutscene skins you demanded look like crap, so I don't see much sense in there.

But most importantly the skins are almost at their limit so it would be a good idea to fill it with custom skins at some point in the near or far future, like Helion said.

The limit could theoretically be increased but that would imply changing ALL following IDs, which will result in pure chaos.