A very minor bug for rotview: the graphical output of does not accept negative rotations, although the command line invocation can accept, calculate and plot them just fine.
It is the sliders in the plotted figure that cannot handle negative values.
That's all!
The GUI sliders are limited to unique ranges for the three angles, conventionally positive. Which ranges would you suggest for the sliders?
I would say that +/- 360 degrees would come in handy. Certainly, that would cover each rotation dimension twice over, but sometimes fits of frames end up at negative rotations and it would be nice to be able to visualize them manually.