Can I turn slices into layers?

Here's a quick script interface to help make the script more accessible without having to edit the code:

/* 
ScriptUI interface added to the original script by SuperMerlin
Note: Intended for flattened or single layer files
*/

#target photoshop;

if (documents.length) {
    var dlg = new Window('dialog', 'Tile Image to Layers');
    dlg.alignChildren = 'fill';

    var panel = dlg.add('panel', undefined, '');
    panel.alignChildren = 'fill';

    panel.tileAcrossGrp = panel.add('group');
    panel.tileAcrossGrp.add('statictext', undefined, 'Tiles Across:');
    var tilesAcrossInput = panel.tileAcrossGrp.add('editnumber', undefined, '2');
    tilesAcrossInput.preferredSize.width = 50;

    panel.tileDownGrp = panel.add('group');
    panel.tileDownGrp.add('statictext', undefined, 'Tiles Down:  ');
    var tilesDownInput = panel.tileDownGrp.add('editnumber', undefined, '2');
    tilesDownInput.preferredSize.width = 50;

    var buttonGroup = dlg.add('group');
    buttonGroup.alignment = 'center';

    var cancelBtn = buttonGroup.add('button', undefined, 'Cancel');
    cancelBtn.onClick = function () {
        dlg.close();
    };

    var okBtn = buttonGroup.add('button', undefined, 'OK');
    okBtn.onClick = function () {
        var tilesAcross = parseInt(tilesAcrossInput.text);
        var tilesDown = parseInt(tilesDownInput.text);
        dlg.close();
        runTileScript(tilesAcross, tilesDown);
    };

    dlg.show();
}

function runTileScript(tilesAcross, tilesDown) {
    var startRulerUnits = preferences.rulerUnits;
    preferences.rulerUnits = Units.PIXELS;
    var doc = app.activeDocument;
    app.displayDialogs = DialogModes.NO;
    doc.flatten();
    var tileWidth = parseInt(doc.width / tilesAcross);
    var tileHeight = parseInt(doc.height / tilesDown);
    ProcessFiles(tilesDown, tilesAcross, tileWidth, tileHeight);
    app.preferences.rulerUnits = startRulerUnits;
}

function ProcessFiles(Down, Across, offsetX, offsetY) {
    try {
        var newName = activeDocument.name.match(/(.*)\.[^\.]+$/)[1];
    } catch (e) {
        var newName = "UntitledChop";
    }
    var TLX = 0, TLY = 0, TRX = offsetX, TRY = 0;
    var BRX = offsetX, BRY = offsetY, BLX = 0, BLY = offsetY;
    for (var a = 0; a < Down; a++) {
        for (var i = 0; i < Across; i++) {
            var NewFileName = newName + "#" + a + "-" + i;
            activeDocument.selection.select([[TLX, TLY], [TRX, TRY], [BRX, BRY], [BLX, BLY]], SelectionType.REPLACE, 0, false);
            executeAction(charIDToTypeID("CpTL"), undefined, DialogModes.NO);
            activeDocument.activeLayer.name = NewFileName;
            app.activeDocument.selection.deselect();
            activeDocument.activeLayer = activeDocument.artLayers.getByName("Background");
            TLX = offsetX * (i + 1);
            TRX = TLX + offsetX;
            BRX = TRX;
            BLX = TLX;
        }
        TLX = 0;
        TLY = offsetY * (a + 1);
        TRX = offsetX;
        TRY = offsetY * (a + 1);
        BRX = offsetX;
        BRY = TRY + offsetY;
        BLX = 0;
        BLY = (offsetY * (a + 1) + offsetY);
    }
}