I've noticed a bug with the text editor box, it took me a while to figure out exactly what was happening in order to describe it well, but I think I can explain it now.
There is a bit of a bug when you hold shift and then click to highlight a block of text. I'm sure not a lot of people use this method, but I'm a coder and do lots of text manipulation and it's just built into my brain to do this, an this bug frequently causes me to mess up my pages because it does not select properly

Anyhow, when you're holding shift and click in order to highlight between the current position and where you click it works fine so long as you didn't already have anything selected.
The catch is, say you first use your mouse to highlight the first 3 lines, then hold shift and click on the 9th line. Instead of the program highlighting from the beginning of the original selection, it starts a new selection at the current cursor position and only selects from there to where you click.
The same is true if you're selecting in the other direction. I think the program should take into account whether or not there's already a selection adjacent to the current cursor position, and add to the current selection if so instead of beginning a new selection area.
Hopefully that makes sense, if you need me to clarify further please let me know.
Other than that I love the program

-Chuck Hall