I've really been enjoying playing with the Melody Embellisher, and I wondered if there were any custom files available to download for it, maybe in the style of certain famous players- or if anyone had a list of settings they generally tend to stick to that gives results they like.

It's such great tool!

I'm not aware of custom files to download.

But you can do it yourself very easily : Experiment and try different settings and then save your custom settings as a *.EMB file.
You can name them as you want, and you have also a Memo field to describe the settings of your presets.

Indeed, the embellisher is a very powerful feature.
FYI, I have written a post - several years ago - to get this feature working not only for the entire song but for a custom section : for example only the last chorus , or from bar 17 to bar 24. No success, maybe in BIAB 2020 !

Thanks, John-Luke. I like your idea of a custom section. Let's hope that comes about