To make recipes different colors in the list window by craftable status, you can change CGMZ_Window_RecipeList.prototype.drawItem. Check the item.canCraft() and add a text code to the start of the drawn string if it can/cannot craft.
Switching category while inside the recipe list would be difficult.
You could also add a font size text code before it draws the ingredients in CGMZ_Window_RecipeDisplay.prototype.drawRecipeItems, though this function is re-used for all item types (ingredients, products, fail products, hq products, tools)