In reply to vitmanod:
you respond in a way that suggests my suggestion is somehow invalid, i don't understand why you write "we want to turn fog off and KEEP render distance on low" who is the "we" here, is this section supposed to be for asking about a specific group or pack?... also the "usually optifine helps but since is 1.7 optifine is not out" part doesn't compute as a complete statement in my mind:/ seems there is some misunderstanding on both sides, let me attempt to be more transparent with my request and why i feel it would be a worthwhile addition.
note: there are already mods which add more/heavier fog (not to be confused with render distance) for non-dim0 dims and for mc versions beyond 1.7. advancedRocketry adds fog per world as an atmospheric effect, this fog can be selected by weight and colour.
i'd like to see a fog mod introduced whereby weight (and preferably colour) can be added to overworld dims, such that a player cannot see through it beyond a certain distance unless wearing a particular piece of armour, having an applied enchantment, having a specific item or under the influence of a particular potion effect, items/potions effects may have differing appearances (item gives+15 to "view distance" whilst effect gives +20 for example). now also a part of the fog mechanic (rather than render distance) a torch or other light source (lava, jack o lanterns etc) could be seen through the fog/mist albeit blurred/diffused.
with such a mechanic the game would have a more claustrophobic feel to it and offer more suspense to a player as well as perhaps offering insight into those with sight loss due to AMD or Cataracts and similarly affected afflictions. i try not to be too specific with my requests, leaving the developers room for expanding upon my thoughts, i think keeping requests concise also helps tho i'm becoming increasingly uncertain about this point of view and indeed if my concise is on point.