Personally, I find that the sighted bow mod for Skyrim was really good. Would anybody like for them become canon? Imo, the lore seems ready. Imagine this: a wood elf craftsman knows the science behind scopes and makes the first sighted bow. He wants them to be widespread and made available for hunters across Nirn. What ends up happening, though, is that the Thalmor tries to reserve the bows for themselves. This could up the stakes for a war in Elder Scrolls VII or something. In ESVI, the player could meet the wood elf (probably ran away), and you help him get started on the innovation. OR they could already be widespread at the beginning of the game, although I think that the Thalmor getting a headstart seems more fitting for the story.

I'm not sure how the story would follow through, but how's the idea?

Besides, I'm sure that players who use the mechanic are probably going to reintroduce the mod when the next Elder Scrolls game is released.

Here is a screenshot I googled:

http://static-3.nexusmods.com/15/mods/110/images/37298-2-1390647429.jpg