Unfortunately there is not a quick and easy way currently (a good reason to accept our defaults as your defaults). We may change this in the future, but currently there is no control in the Shop Standards that controls this, other than the top opening height (line 68 of the Shop Standards), and we calculate the top drawer openings, which makes that setting irrelevant (nothing reads it).
For the time being, if inertia ("that's how we have always done it.") prevents the paradigm shift that would allow you to utilize our current default top drawer front height of 157mm (6-3/16") , then you could set your own default top drawer front height by going to each cabinet dialog box, setting the top drawer front height to what you want, then right clicking on the Top Drw Front Ht field, then clicking the top option- "Set Default For [' Top Drw Front Ht=148], with 148mm being an example, but this can be anything you want over 148mm or 5-13/16".
