So many players want to have new graphics, but the main argument against these graphics is the people with low end. Some say allow it to be enabled or disabled but that will change gameplay too much if some updates are implemented from low end to high end.
Here is a list of things that i think would be nice to add but wouldn't change gameplay. Also they do not need too much work.
FXAA: Post process AA, less demanding that MSAA
16xAF: Makes images look better from far away and to the side. settings would range from 1x, 2x, 4x, 8x, 16x
change AA in game: settings from 1x, 2x, 4x, 8x, 16x
raise terrain polygon count: No more hills with sharp edges
waves on water: simulate waves on water.
trains between town and airfield: taking down these trains will prevents all airfield objects from being resupped besides hangers. trains are sent if any object on the field is down. If train taken down or more objects needed to be resuped, every 5 minutes a new train is sent to the airfield. same process for town.
small holes in terrain: Allows for small pot holes placed by map makers to limit GV speed.
I think these would add some immersion and better graphics while not cutting off low end users and not changing gameplay too much.