Autosave
1) Autosaves when you drop an item, just like when you pick up an item (would eliminate "duping")
2) Autosaves when you enter Boss Fog gate (would eliminate having to complete entire level again just to get to Boss if you die in Boss fight). Alternatively, have at least an autosave at the halfway point of the level.
Trophies
1) EVERY Demon Soul is used for THREE things: one spell, one miracle, one weapon. Have to COMPELETLY do NG, NG+, and NG++ to get everything. Requiring 4 playthroughs is ridiculous and gets BORING.
2) New Trophies:
a) Assist 100 players as Blue Phantom in Boss fight. Must beat Boss to get trophy. Encourages online play
b) Kill 100 Black Phantom invaders. Encourages online play
c) Obtain Stat Level of at least 50 in every stat (does not need to be on same character). Encourages use of different skills/play styles
d) Complete game without dying (possible to "glitch" by quitting when you die though)
e) 100 kills with each weapon type (bow/crossbow, axe, blunt/fist, spear/pole, Asian sword, Piercing sword, Straight Sword) - 7 different trophies. Encourages use of different weapons/play styles
These new trophies would make obtaining Platinum more challenging because they are based more on skill and diversity than merely on time spent playing the game.
Ores
Geckos and enemies who drop ores will drop at equal average rates - 60% Shards, 25% Chunks, 5% Pures, and 10% no drop. Rates based on average over 200 kills of same enemy. This is at neutral WT. At PBWT, the rates would be 30% Shards, 60% Chunks, and 10% Pures. At PWWT, the rates are 75% Shards, 10% Chunks, and 15% no drop. Farming sucks in this game - make it a little easier and less time consuming to obtain ores you need to upgrade weapons. Along with this change however, there are limited numbers of Pures available per playthrough. Say two. Once you get two pures of one ore in your playthrough, the drop rates adjust to the PWWT tendency drop rate for the rest of that playthrough.
Any other ideas of fixes/changes you'd like to see if they make a DS 2? Not new enemies/weapons/etc. since there are already threads on those things.