The modern cajón is often used to accompany the acoustic guitar. The cajón is popular in blues, pop, rock, funk, world music, jazz, etc. Cajón is often used by bands instead of a full drum kit when performing in minimalist settings.

Great idea Josie, but it also might be worth posting in the Styles and Real Tracks wishlist forum too

I could make up a RD set with the Cajón but there is so many different beats.
I suppose I could make up a Sw set and a Ev set with a lot of variations to choose from ?
There are a lot of Cajón Kontakt and soundfonts that you could use with RB drum midi to get the beat you need, there's also loops.

Here's some freebies you could try:
http://www.sonic-cat.com/cajon-free/

http://www.musicradar.com/news/tech/free-music-samples-download-loops-hits-and-multis-217833/95

http://www.cajonroot.com/cajon-samples