Currently, the only way to directly use custom operators is to call ”apply” on them one operand at a time, creating an intermediate variable card each time. It would be nice to have a slot in the logic programmer where you can put a custom operator and then call it just like you would a built-in operator, with all of its operands at once.

Something like this is planned for the custom operator creation feature.

But in the meantime, I can easily add some more convenience apply operators with more parameters (apply 2, apply 3, ...), the code already supports it, there is just no visual interface for it yet.

Implemented in 2b1c321

The LP slot is future work.