Ah yes, the default collapsed levels of PivotSQL are by designed for faster loading reason. We will see if there's a way to make at least one level expanded by default without sacrificing too much speed.

Right now we have a client-side command to expand all nodes of a level, such as "productLine". You can even run it upon PivotMatrix loading to expand a level:

    PivotMatrix::create(array(
        "id" => "PivotMatrix1",
        ...
        'onReady' => "function() {
            PivotMatrix1.batchExpandCollapse('row', 0, 'expand'); // expand all nodes of row field level 0 upon loading
        }"
    )); 

Do you think it's good enough for your case?