Does anyone know if there is a mod where the dunmer's writing is in Daedric rune... I always find it weird that they comply and speak imperial. I would have thought that especially the dunmer from House Telvanni and the ashlanders would have spoken nothing else than dunmer. Obviously the actual language would be pushing it but if the writing was in daedric rune it would make more sense..
Does any one know if such a mod exists?

Why is it weird that all Races speak the "common-tongue" ???

And no, I do not think this mod is possible. I believe Morrowind only recognizes 2-3 different types of font.
A n originally made modded font would certainly not work..... I think.

I think they all speak http://www.uesp.net/wiki/Lore:Ehlnofex_Languages with slight local variations

Perhaps that is what they write with - though for spells and town names they seem to use daedric? To be honest i would find it hard going reading the biography of Barenziah in daedric