The first couple years I had ChessBase, I did spend a lot of time reading Steve Lopez's column on how to use different features.
To find the smother mates, I used the position tab to search for the position below (except without the white king), checked the mirror horizontal and vertical boxes, and selected games ending in checkmate in the game data tab. Repeating the same search, but with a knight where the rook stands turns up the additional data. Of course, there are other smother mates that occur away from the corners, and this search did not find them.
Wow Ziryab, you're much more sophisticated in your use of chessbase than I am... I have a question, how do you have it search for all games containing a smothered mate like that?
Also I never thought to create a database of only [insert favorite GM] games, then use their games as a mini opening database for you to emulate... don't know why I haven't heard of this, sounds like a great idea. For example if two GMs separated by 50-100 years play, say the French, and you love the french, you can contrast the two, if you need a "novelty" for some young punk, pull a popular line from 1930, if you're more interested in current theory follow the other.
Any more advice on how to use chessbase? Or have I just not read the help files?