-Many games has slots in character screen for tools too (not only weapons are useful in RPGs). It would be nice to have our gold, shovel, magnifying glass, lockpicks, etc in dedicated slots.
But that would be a little spoilerish. I'm the kind of player who doesn't look things up but experiment. If you point all the tools to me, half the puzzle is solved.
2/ Add a specific window for craft. [etc]
That's kinda already there when using the backpack. If the backpack window was bigger, it would help a lot though.