I haven't thought about the implications of your request, but I have two workflow suggestions.
The first suggestion is that you can type c*b to quickly find a CoronaBitmap map in the Material/Map Browser's search field.
The second suggestion requires some preparation. Open the Material/Map Browser's drop down menu and create a new material library and name it for example favourites.mat, then drag and drop in this new library a CoronaBitmap and rename it as CBitmap. You can now type cb to quickly find a CoronaBitmap map.