aescript; snap selected layers to the corner in composition.

snap.jsx

function snap (x, y)
{
    var item = app.project.activeItem;
    var layerIndicies = [];
    for (var i = 0; i < item.selectedLayers.length; i++)
    {
        layerIndicies.push(item.selectedLayers[i].index);
    }
    
    item.layers.precompose(layerIndicies, item.selectedLayers[0].name, true);
    
    var precomposed = item.selectedLayers[0];
    precomposed.transform.scale.setValue([50, 50]);
    precomposed.transform.anchorPoint.setValue([
        [[item.width, item.height,], [0, item.height,]],
        [[item.width, 0,          ], [0, 0,          ]],
    ][y][x]);
}

app.beginUndoGroup("snap");
snap(0, 0);
app.endUndoGroup();