Carpe this is 1st Ed. The REAL d&d .There isnt any skills like Diplomacy.
Jay Two points
1) They aren't missing in the movies. They are doing damage. Hit points are abstract. However for a truly great swordsman to not tax the abilities of a novice he would have to do something like trip over a shoelace.
2) It shouldn't affect the tactics much in 1stEd. Save for half spells become save for half and nothing 5% of the time. Save for Neg. spells become save for neg or backlash 5% of the time. It makes all offensive spells more risky but balances it out with more possible gain...