This was just added to Vermintide 2 and it is a super useful feature, allow the player to bind the same action (tag or weapon special for example) to two separate buttons at once.
+1
I wholeheartedly agree. Really jives up my gameplay 
Great game
Bumping this thread since it already exists and this still seems to be missing in the game.
I would like secondary bindings for all actions and remappable menu controls as well. Confirm and cancel in the menu controls remapping could have four bindings. See my Steam post here for other PC-specific features.
For controller, if the developers can’t add full remapping, they should at least add settings for swapping the shoulder buttons: RB/RT and LB/LT and another setting for RB/LB and RT/LT. The settings can be combined. I don’t know if this in the game.