(another one of those tiny issues)
If I'd compare the helptext at the bottom of the NCrunc Configuration window I'd compare it with the Properties window, for instance, where the text is a label that cannot receive focus (and has a title and a different default background color, but that's a design choice, I'd assume).
Also, when a grouping item is selected, nothing is shown in the helptext (fine, I guess) but this leaves a rather weird greyish window with nothing in it that can have focus, a blinking cursor and a copy/paste menu (greyed out, but it's there).
See how, at least with my color scheme, it looks as if it is an active window (imagine the blinking cursor):
(I came to this issue when I opened VS and found it weird that I had an edit box in my bottom-right, which is where I fixed the configuration window (I need it so often that it's constant visibility is welcome). Because of the big white rectangle it looks like an active window with focus, it has more primence that way than the output window and honestly, believe it or not, I tried to type something there before I realized what it was :D )