It's called Standard Plus library and not Extended Plus library, therefor only instruments of the Standard library are included.
The fast repetitions are extremely useful for fast double, triple or quatruple repetitions .
At a fast speed and only using a few repetitions the samples are have a lot of flexebility and don't have to match exactly a certain BPM speed.
Also it's very difficult to perform fast repetitions on a keyboard. (it's pretty easy for a string or wind instrument), so this is maybe the only chance for many keyboard players to perform fast repetitions easely on a keyboard.
best
Herb