I just stumbled across the KoReader app for jailbroken PaperWhites & Touch Kindles that is pretty darned amazing.
You can read about it here
https://www.mobileread.com/forums/sho...d.php?t=209276
Among other things this alternative reader offers is:

2-column landscape mode (yes!)

The ability to change font weights

Support for just about every format including epub, pdf, djvu & mobi

Night mode (yes!)
and a whole lot more. Basically, it's a much better reader than Kindle's native reader. I had no idea that this existed so I thought I'd share the information.