Rather than having to define constants as variables first, it'd be nice to be able to enter constants directly into an operator (as in I'd just have to type "0.5" in one side of a greater-than card order to check whether something was half full). If that's too difficult to implement, then an alternative would be being able to right click with a variable card to set it as a constant rather than having to use the programmer.

Something like this would become part of the planned advanced LP.