Replace the constraint expression language with a UI equivalent

[digitalbricklayer]

The expression UI implemented by the Mirasvit advanced product feeds module create product filters gives a good example of what can be achieved without having to create a DSL. I fear that the DSL may provide quite a steep learning curve. A UI where the expression is created from pre-configured UI elements would be much easier to learn and wouldn't necessarily come with the cost of reducing expressive ability.

[digitalbricklayer]

When looking at an expression from the nqueens file, $cols[i] + i <> $cols[j] + j this does look like it would be quite difficult to create a UI for.