Use strong name instead of enum GUIStyleName.

[zwcloud]

For example,

class StyleName
{
    public static readonly StyleName HorizontalCellSpacing;
    int value;
    string name;//for debugging or serialization
}

Then use in code:

GUILayout.PushStyle(StyleName.HorizontalCellSpacing, 5);

[zwcloud]

Converted enum to class at commit cf38505.
TODO implement flexible custom named style

[zwcloud]

done at 341333e