My Apologies.

I have, almost by accident, found the 'wacro' tools in Materials room (advanced).

Had read of such in manual, had looked for them several times, thought lack was something to do with now-lost Python facilities...

Using the Reflection option, can now one-click materials into mirrors, though Poser does keep trying to render with Firefly instead of my preferred Superfly.

Will see how plays with masks etc...