Perhaps this might tie-in with the inventory, but I'd love to see an easily customisable pop-up screen that's clickable/interactive. For example, you could press 'M' to bring up a map with locations that you can click on to fast travel there. Or it could be used for a list of objectives.
Also, I love the sliders in the current beta. I wondered whether there could be a drop-down check box when building the game that would let us choose some of these sliders to appear in our game menu screen for the player. For example, if we wanted players to be able to change FOV and Fog distance (but nothing else) from the games menu, we could just check those.
"It's power babe, power. I don't create it, I own it."
