OK this may be a long shot...but i was sifting through some files in E:TW data folder wishing i knew how to mod and i came across a line of script:

...""elseif conditions.AdviceJustDisplayed("-1766231494", context) and not CampaignUI.IsMultiplayer() then
scripting.game_interface:set_zoom_limit(1.08, 0.02)""...

I thought possibly added to allow integration of the multiplayer campaign whenever that finally arrives...

Anyway just thought id point it out.

edit: file found in data/campaigns/main/scripting.lua