You can collect chests or other containers to put things in.
In the options you can disable edge scrolling with the mouse, or lower the scroll speed. The Home key will also recentre on the lead character.
Sometimes during the battle it happens that one of your characters gets on the top of the enemy and it's really hard to find a clickable part to attack, you have to try to circle around the camera to find a spot. Can that characters be made click-through so that we can always target enemies, loot?