It should either by given the additional ability to grant you the keen-scout perk for free, or it should keep radar up while aimed with all of your weapons (except maybe snipers), not just your primary.
Minatosensei4's idea:
[quote]It needs the ability to keep radar up, regardless of the weapon type, and have enhanced radar like Keen Scout and Relentless Tracker. Perhaps the ability to highlight enemies with a red outline when ADS like the Signal MS5 Omolon sight.[/quote]
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It used to give you radar while ADS on all weapons (i think, I could be wrong) but then they changed it to primary only. In my opinion, it is good as is. Third eye is a very powerful perk IMO. So the fact that you can get it with ANY primary (First Curse!) is very strong. It just depends on how you want to use it.