I just finished mapping my gamepad to the appropriate keys. Now, I needed to swap items from the toolbelt, to my inventory and vice versa. I can't figure out how to do it aside from going back to my PC (which is far from me) and right clicking the swap destination of the item. Same goes for dropping items. There's a button called "Drop" on the inventory screen but I can't reach it other than using the mouse.
I have connected my PC to the TV so I can play from the couch. I have the GOG version.