This is somewhat similar to another post regarding issues with controls however, I cannot remember where.
Despite this, As an IT Technician and Programmer, I have not discovered or needed a usage of key bindings in such a manner.
I you wish to use key bindings to help with Guns Of Icarus, get an Massive Multi-player Online (MMO) Mouse. I have a Red Dragon Perdition which I brought cheaply on Amazon to experiment with and, I use it for everything now
I have allocated the keys in this manner to help with my game play:
Look of Mouse side.
1 4 7 10
2 5 8 11
3 6 9 12
Buttons allocated:
1 = z
2 = x
3 = c
4 = 1
5 = 2
6 = 3
7 = p
Oh and the mouse has 5 profiles allowing for a total of 60 allocated buttons.
I still have not found a usage for the 16400 Dots Per Inch sensor... My 27 inch Monitor is not big enough for such pixel detection.