Sorry, doesn't fix it for me ;-( I've tried all mods: Nossao, nomipmaps and lowtex, but they do not fix the stutters.
I just run the 'cross country' mission. If that simple mission (1 bomber flying over land) runs without stutters, I consider it fixed.
Rgs,
FP
edit: Ok, go it to 'work'. First tests did not load these mods properly I guess. Loading them by using the steam client options did not work for some reason. Now created a shortcut and they load. mipmap mod however leads to many strange loading results. First quick mission loads, then others will as well. If I choose cross country as the first mission, then the game won't load. Shimmering is a bit too much for me, but nice to see the stutters have been 'fixed'. The problem is now known and 1C/Maddox should know what to do...