I am starting to create more screenshots and other diagrams, which belong in acs core docs. But I don't want to bulk up the core again. I think the right solution is to make acs-extra-docs. There are then two approaches to integrate it with core docs.
1) Tight integration: Core docs have a lot of graphics that just say "install acs-extra-docs to get this graphic"
2) Extra docs are a completely different section of the docs, just like any package docs.
Opinions?