I know how to select all rows below a point!!!
I made the most amazing discovery - after years of people complaining about this obvious flaw.
Out of my relatively small 40,000 records CSV, I had to split them - and I didn't find a clearly defined uncomplicated way of doing that ala Excel where you hold down two keys and hit "End" and boom, you got everything below row 10,000 all selected, primed and sitting pretty waiting for a simple Ctrl+X to cut and paste into the new sheet.
So, I devised a very easy way.
Thank you Apple for giving me the power to decide!!
MacBook Pro with Retina display, OS X Mountain Lion (10.8.5)