First of all, I think by saying "aura" you mean the animation effect.
Secondly, it is not a problem or a bug, imo. The game was designed like this.
Thirdly, there is a solution, as you said so yourself, dont zoom out in uncapped flags. Wait at least 3-4 sec, for the cap to turn yellow.
Lastly, About big maps like Ziku or Levi, you are absolutely right. You cant play in these maps competitively, if you never zoom out. You just wont be able to keep up and watch for portals, flags etc. But on cataract you can, by moving the camera all the time, panning through the whole map, or at least the key points like the portals for example.
p.s. As far as I know, there isnt such a mod, to change this.