[Tilecache] OverviewMap control config tips?

[cmose]

My map is configured with the following options:
var mapOptions = {
    minExtent: new OpenLayers.Bounds(-1,-1,1,1),
    maxExtent: new OpenLayers.Bounds(-180,-90,180,90),
    restrictedExtent: new OpenLayers.Bounds(-180,-90,180,90),
    maxResolution: 0.17578125,
    numZoomLevels: 8,
    buffer:1
}

and my OverviewMapControl is configured with these options:
var overviewMapOptions = {
    mapOptions: {
        maxResolution: 0.17578125,
        numZoomLevels: 8
    }
}

(please forgive any typos as this was hand transcribed - the actual config
is free of typos and works fine with my current TileCache setup).

The issue I have is that the OverviewMapControl is basically useless from
zoom levels 0-3 - the red "extent" rectangle just fills the entire
OverviewMapControl and can't actually be used to drag the map more then a
very minuscule amount. I've looked over the js file but I think I'm just
having a poor comprehension day as I'm not seeing what I can change to try
and alleviate this.

Ideally the draggable rectangle would stay constant size regardless of the
zoom level of the overviewmap/bounds of the "main" map.

Anyone have any hints/tips as to how I can accomplish this or at least
provide a useable overviewmap at zoom levels 0-3?

Thanks!
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