I don't know of any mods out there yet, but a good .ini tweak is to increase the value of uGridDistantCount to higher than its default (which happens to be 20).
Be careful increasing this value though. Even increasing it to a setting like 25 can severely hamper performance on even the most powerful systems. So tweak in moderation.
What I really want is a mod that increases the quality of distant land textures. It's annoying to snipe someone from far away to see them land in slow motion on a VERY BLURRY ground texture even though they're like 50 meters away or something.
uGridDistantCount = How far distant actors are drawn
uGridtoLoad = How many cells are drawn...when you're walking along and you suddenly see a big chunk of road and trees and buildings change from blocks to proper textured things, thats a cell. only use odd numbers 3,5,7,11 etc
fBlockLoadDistanceLow and fTreeLoadDistance = the distance at which trees and misc items use their low LOD texture
fSplitDistanceMult = the distance at which the ground changes to low LOD
Cranking all of these up will cause crashes regardless of how good your PC is.