[Sombre]

I'm with the "this is clearly a bug" crew on this one. You can get into all the semantic hoohah about what exactly qualifies something as a bug, but to me it sems pretty simple; it's a quirk of the weapon system which could and should be fixed. It's not what you'd call high priority though.

If the devs intended you to have to put a shield in the last slot to enable default missile weapons and programmed the game that way,.. well then there's no point in me trying to understand whether anything is WAD, because they clearly have very unusual thought processes.