This is a relatively small issue, but one that I think you can fix rather easily.  It happens when you drag rows (like in your demo).  It's an "undocumented" function but one that might be useful to remove unwanted artifacts related to the text getting selected.  Namely the jQuery .disableSelection() method.  A short description is here:

http://groups.google.com/group.....11ae23a392

Adding this code around the cells of the grid that have draggable rows would, "I think," make it so the text doesn't get selected as the cursor drags over.  Might even be possible to put this around the entire grid (which is something I can test in code myself).  Just a thought to make the dragging feature look cleaner.