The problem is that this kind of settings would pile up and the inevitable conclusion would be a massive dialog with loads of unrelated checkboxes for which you need a manual for.
Going a little bit further, you could find you want some sort of method to save the custom configuration, because you know that a few months down the line you might open C3 in another computer and of course you forgot about all the customization you did a few months ago.
In my case I have come across this problem when using text editors, I use Sublime Text when working on C3. It does have a ton of options for customization and initially it seems so cool, but for practical purposes you only want to change a handful of things, namely the color scheme.
After years of working with it, I find the rest of the options superfluous. The best settings are the default, purely because they are the default. If they weren't the best, they wouldn't be the default.
To sum it up, I think it's better to work towards reaching default settings which work well for the greatest amount of people.