The Render Firefly script, which was last seen in Poser 11 and not updated for the subsequent versions of Python, was a tool I used all the time to tweak the settings and render, which I found to be far superior to the basic Poser Render Settings window as it gave more precise control to allow me to get the best balance between quality and speed and options for output, is something I miss horribly and has been one of the reasons I've been slow to move on from Poser 11. Even small things like the render timer.

I've looked for things which give similar usability but haven't been successful. Is there something out there that's the equivalent that I've missed or overlooked?

Which features are you missing? I used to use the script long ago but haven't rendered in Firefly in ages. Comparing it to the Firefly render settings, most of the options seem to be there. But like I said, I haven't used the script or Firefly in ages.

Poser does have its own timer in the message logs.