Remember . . . Rudiments are combinations of single, double and multiple stokes combined to form unique patterns. These stroke combinations are the foundation on which snare drum playing is based.

WARNER BROS PUBS

Rolls are certainly one of 3/4 key rudiments -- they actually are components of other rudiments (Ruffs, Ratamacues, etc). Several great players have written instruction books demonstrating their theories on how to apply rudiments to the drumset. Joe Cusatis, jazz player (long time accompaniest for pianist Peter Nero), owner of the Modern Drum Shop in NYC (mecca for working pros in NYC) and drum teacher, contributes the following from his WB book, "Rudimental Patterns, Full Drumset Studies for the Modern Drummer".