nah, morrowind is fine as it is, oblivions flying objects exercises could stay in oblivion, pun intended
some stuff from oblivion would be nice,like voice actors,but as someone put it,1000?s of random people from the street would be better than a few elite voices.
the other nice stuff in oblivion is already fixed by modders, toggle sneak etc, actually it is one archer mod that I miss in morrowind,duke patrick have one I use,don?t have that in mw,the rest is done with mwe,mwse and ordinary mods with no connection to oblivion resources. edited for clearity.