Im not sure if it has scope flare because Ive never been killed by one (that I noticed) but if it does NOT have scope flare (shouldn't given the iron sights), then the ultimate perk for this gun would be temporary invisibility (Like on Patience and Time)! Then this gun would be awesome.
In lieu of that, two awesome features would be nice:
1) Poison Rounds like with Thorn
2) A Bayonet for a sort of "Power Melee"...
So far nobody seems to like this gun but I think it is an awesome concept weapon. Definitely suits higher-skill snipers more than anyone else, but still, I think its well worth making this gun a "big deal" with these sorts of perks.
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I think the only way you could make No Land Beyond a good gun would be to give it some form of burn damage, increase reload speed, and change it to be used in the secondary weapon slot. I'm not a big fan of it being a primary due to the low ammo count and limiting your loadout to be entirely about range or inaccurate mid range game.