Key bindings

[Wiley 49]

Hey all. I just picked up ArmA for this, and have been finding new and interesting ways to die since Wednesday. Got a bit of an odd issue, and am wondering about either fixing it or doing some kind of workaround if need be.

I have a 4 button mouse. While I was downloading Day Z I was going through boot camp on ArmA to get my head wrapped around the control scheme, making tweaks to the button settings as I went. I got everything working how I wanted it in Boot Camp. I didn't like reaching for Enter as often as I found myself doing it, so I put that binding (default action? Something along those lines. What you default hit the normal 'enter' button for) on mouse button 4. It worked beautifully.

I downloaded Day Z and logged in, and immediately noticed that button isn't working anymore. I went into the controls part of the game running Day Z, the binding is gone. Here's the odd part- I tried to bind it, the button does nothing. I press it, like I've been doing all along changing the bindings I've changed, it doesn't recognize it.

I go back into a Boot Camp mission, works fine.

Any ideas? Any file I can edit manually to add the mapping? Is it a distinction between single and multiplayer using different config files or somesuch?