Thanks for all the feedback.
I made the effect optional using preferences. I did this to make sure I don't annoy people with a half baked feature, since there was a related bug reported. I don't really want to create preferences to all new features, becase that will create challenges on the maintanence and testability side, but this time I seem to be listening to @GibbonForever.
@friendofblahaj, thanks for the feedback. I added the delay, because otherwise it was flashing during mouse over from one sector to an other in a way, that I could not stand.

Maybe the delay could be shorter, I will play with it.
I also released some improvements on "auto select sector choice when Better"
- today I released an improvement for the idea of @Snickitypuff, about considering a choice better if they are otherwise the same, but one allows adding cubes, while the other doesn't
- it is combined with a previous improvement, that cube slots are only considered if there is actually an empty slot.