Yep, they could've easily made the controls better. At least give the option to quickly access everything you need to play the game without additional menu's. A keyboard has this wonderful accessible way to access a lot, through numerical keys and the F1 to F12 keys. Otherwise, at least give a scrollable option, with for example [] and ; ' buttons to scroll through available gadgets and skills. Better even, provide both. And yes, really, a functional scrollwheel.
Also, a minimap would've been nice, and although you can access the map through m, when exiting it you go back through another menu instead of going back to the game.
All in all, the interface really isn't top notch, but in the end it didn't bother me that much. I never used more than 2-3 skills or 1 gadget at a time anyway, and I never really needed a map anyway.