Suppose that I add this by default in HikaShop:
People will then ask how to remove the yes / no. And in that case, they'll still have to go in the Display>Custom fields menu to change this. And worst is that they will have to remove the "Display limited to" from the other fields which most will probably don't think about, and then they won't have the fields displayed, and they'll think that it might be a bug.
And I don't think that creating a custom field requires a developer background. Yes, for some people computer is hard. But then, either they should have someone do it for them, or they should not change this. They could simply enable the address_company custom field so that people can enter a company name if they want. In most cases, a yes/no is not necessary.
I think that most people want it the way we have it now, and the minority want the yes / no. So changing this to be the default is, I think, a mistake.