This post´s objective is to provide arguments for this suggestion and show how many people is interested in this.
I have realised that there is people who likes this setting as it is at the moment. Therefore, I suggest that Opera Developers could make this feature posible but as an optional feature, thus, who wants to keep this setting doesn't need to do anything and the people who is asking for this setting can change it.
I know that this is not so easy as I described. In this case, I'd like to ask for a reason to not have this feature available.
Regards