Shift + Drag not simulated correctly

[EvHaus]

Simulating keyboard options with drag events doesn't work. ie.

$(document.body).simulate('drag', {
    dx: 0,
    dy: 0,
    shiftKey: true
});

The "shiftKey" option is never passed through. Please update the "simulateDrag" method to passthrough all keyboard options such as shiftKey, ctrlKey, etc...