Add a command for ranged attacks

[Grond]

As far as I can tell it’s not possible to use ranged attacks via keyboard. There should at least be an option for it in the radial menu, or ideally a dedicated key. As is, there are some practical problems with shooting in melee or dealing with obstacles when there are no monster around.

[Jochen Terstiege]

Fixed, it's now possible to start range combat with the "t" key.