1. Make sliders wider,
2. Make a button to switch from normal game window with chat and few hotkeys to hotkey bars to the left and right, that way you can easily tap desired hotkeys with both your hands. Or place hotkeys to the left and add navigating arrows to the right.
3. It doesn't apply well to the current game at this moment as it could be useful to I dont know? To chat with other players and surely for people that are into market-thingy. However if you change the game that way it would include time-consuming, repetitive but also rewarding and profitable tasks, like I mining minerals, fishing etc. it may encourage your playerbase to use it while commuting or at work/school.