Hi Matt,
Unfortunately it is not possible today to use different constraint operators.
Today Popoto.js uses an exact match on the attribute value defined in configuration for a given label.
So it's not possible in graph to add multiple value or use different operator on a node.
In future I would like to add more nodes types which could be used for example with a context menu, or advanced UI, add a constraint on a specific attribute, use AND or OR operators.
But my main focus is still on usability, I target non technical users and don't want the UI to be too complex.
Let me know if you need more info.