First of all, you need to use keyboard a lot. In a game where complete interaction via mouse should not just be possible but preferable. Keyboard controls aren't the best either. Haven't figured how to split stacks easily, there should be an option to assign shortcut to stack sizes I prefer (split 100 something into ten stacks of 10 each, for example). Everytime I place something in inventory it adds up. Maybe I would like it to stay the way I put it? Introduce inventory arrangement options. There is no close button (X) on windows. That is insane...
Heard there are mods that add bunch of extra functionality, even some in game modding by writing code in C++. Will have to try that out. Still, stuff like that should be part of base game.
I love the graphics in this game, they are so delightfully retro. Truly looks like a game from 1995. Unfortunately, it plays like one. Good thing I've played Diablo, Commandos and Crusader series recently, because I would go nuts. Those old games are excellent but have same interface/control issues. Modern games let you do some things easier way.