I did not expect this but the default kernel on fire tv has swap support. I'm on the latest prerooted rom from rbox.. To quickly test I created a file using dd, did mkswap and swapon. Currently I'm using a microsd with usb card reader and using microsd as /data. Now that swap is compiled in kernel, I plan to hook an external hard disk or ssd and add some swap space. External hard disk or ssd should be much faster.