I use an odd config for my key binds in all games. In brief this is how I'm setup.
Mouse 1 - Forward
Mouse 2 - Fire
Space - Optics
A - Stance Up
S - Back
D - Strafe Left
F - Strafe Right
Shift - Duck
Left CTRL - Prone
When I try to use this config, I can not walk forward and when I fire I can only semi fire and it fires on release of Mouse 2 not on key press. When I toss a grenade I am no able to change the grenade, I am only able to throw the grenade with minimal power resulting in a toss 5ft from my body.
So in order to make this work I have to remap keys in my Logitech mouse driver software.
Mouse 1 remaps to - W
Mouse 2 remaps to - Left Click
By doing this everything works properly. I can walk/run forward and I can shoot and toss grenades.
Still I would like to play the game without remapping the keys in my Logitech mouse driver software.
Why:
1 - It is time consuming and feels like it shouldn't be needed. For less experienced players this would be a road block.
2 - By remapping keys (W for example). I lose access to that key by not being able to bind it to another action, as both W and Mouse 1 are bound to the same action.
3 - By mapping (Left Click) to Mouse 2, I am forced to use Mouse 2 to select everything from within all menus, inventory, communication tabs, etc. This gets annoying fast, as it is very unnatural.
Most games work properly with my config. If I remap Mouse 1 and Mouse 2, Mouse 1 is always click regardless if I rebind it's action. Most games do not consider Click and Action as the same task. Nor should ARMA 2.
I really dig the ARMA series, but this issue has plagued both titles in this series. I would be V-E-R-Y regretful if this issue get resolved by the time ARMA III is released. Addressing this issue in a future ARMA II patch would be much appreciated as well.