If you use both Scroller and KeyTable together and use the arrow keys to navigate around the grid when you get to the end of the current page the keyboard navigation goes wrong.
I've created a jsfiddle here based on the Scroller Server Side Processing example only with the Keytable plugin added.
If you run that and select a cell, then keep pressing the down arrow. Once Scroller starts changing the data the focus starts jumping around all over the place.
I believe the currently selected cell is held based on an index that isn't reset when the data displayed is changed.