I know that the ability to remote control would be useful for many usage of Sound Show and I'm looking into it. I'm working on a remote control app but I've not yet a date of release
In the meantime, it is already possible to find workaround since Sound Show may react to keyboard inputs even when not focused. For example, this rpg dm made it works with its ipad as remote control :
I like the idea of an API with files in a folder and I'll keep it in my possible features list but in won't be on top of my current priorities.