Feature Request: Add 'Padding' Property to Network Graph Nodes

Currently, when drawing network graphs, there is not a lot of spacing between a node's internal label and its border - the node's internal padding is minimal. Increasing this internal padding, however, does not seem to be a trivial matter. As a newbie, I've read through the docs, trawled through StackOverflow and Google, but have not found a way to do it.

Ideally, this should just be another node property that the user could set easily, like this:

var nodes = new vis.DataSet([
    {id: 1, label: 'parent', padding: 18},
    {id: 2, label: 'child 1', padding: 9},
    {id: 3, label: 'child 2', padding: 9}
]);

If there is an easy workaround that I've missed, I'd be extremely happy to find out!