The Generic material settings are organized in Basic and Advanced modes. You can switch the mode from the toggle button under the Preview Swatch or globally from the Configurationrollout of the Settings tab.
An Add Layer button is provided for some V-Ray materials, including GenericStochastic Flakes. You can select an additional layer that can add up to the appearance of the material. Note that the added layers can be removed and rearranged, as shown on the MaterialsAdd Layerpage.
The context options of the Color Slot allow to Copy and and Paste a color from one color slot to another, as well as to reset the color selection.
A Reset option is provided in the context menu of each Number Slider. You can reset the slider value to the default one.