Ability to play files in a folder without interruption?

Not yet as far as I know.

You may find this script that integrates Foobar2000 with Directory Opus useful.

I certainly liked it ! I liked it enough to have my titlebar toolbar include it.
Normally, I just use it for long nature sound tracks when I'm deep in isolated thought.
But if you want to Rock or whatever it can do whatever you need !

I have a few albums from my local Charlie Parr that I guess at least one was once used in an Australian advertisement for something called 'Vodafone' whatever that is.