Be careful with this. Chris ran into the issue where arrays don't merge, but replace. This is the default merging behaviour. If you need to have these merge you'll need to employ a specific merge policy in your component that uses these as grades. Here's the example we gave to Chris.

```javascript
    gpii.uiOptions.panels.arrayMergePolicy = function (target, source) {
        target = fluid.makeArray(target);
        source = fluid.makeArray(source);
        fluid.each(source, function (selector) {
            if($.inArray(selector, target) < 0) {
                target.push(selector);
            }
        });
        return target;
    };

    fluid.defaults("gpii.uiOptions.panels.increaseSize", {
        gradeNames: [...],
        // top level option
        mergePolicy: {
            repeatingSelectors: gpii.uiOptions.panels.arrayMergePolicy
        },
        protoTree: {...}
        ...
    })
```