Yes it has!
Very simple, only one command -b , which stands for Build
To build multiple .suv files command line would look like this:
on Windows: [installation path]/SpriteUV2.exe -b [.suv file path], [.suv file path], ...
on Mac: [SpriteUV2 folder]/Contents/MacOS/SpriteUV2 -b [.suv file path], [.suv file path], ...
Example:
C:\Users\[ User Name ]\AppData\Local\SpriteUV2.exe -b C:\Examples\raptor.suv , C:\Examples\goblin.suv
And since .suv file is very simple JSON file all export locations can be extracted and applied to Spine command line after build process finished, I think batch converter can be easily implemented in node.js for instance.