Is it possible to highlight the entire row’s background color, from the far left of the div to the far right, instead of just the text portion of a node?
I’m not pretty sure what do you mean by "highlight"
If you mean just changing row color it can bo done by many ways
from XML as <row bgColor=“red” …
from JS API grid.setRowColor(ID,“red”);
If you mean natural selection - it is blocked by default, and can be enabled by small modification in grid code
1. In dhtmlxgrid.css locate and erase all occurences of next line
-moz-user-select:none;
2. In grid initialization code add next command
grid.entBox.onselectstart = function(){ return true; };