Mouse Button 4 & 5

After reading through a bunch of threads and wish lists of many but not finding anything that I could just hack in I went and did a bit of discovery. I'm not sure what I have unleashed but it works so far and any comments or thoughts in the area of learning would be appreciated.

To enable mouse buttons 4 & 5 (which I haven't tested 5, I will have to dig out a mouse with another button on it) I did these quick hacks:

In engine/platformWin32/platformWin32.h, change _WIN32_WINNT to 0x0500 as noted below:

// define this so that we can use WM_MOUSEWHEEL messages...
    #ifndef _WIN32_WINNT
    #define _WIN32_WINNT 0x0500
    #endif

In engine/platformWin32/winWindow.cpp, add the following so it appears like this:

Game->postEvent(event);
                   }
                   break;
                case WM_LBUTTONDOWN:
                   mouseButtonEvent(SI_MAKE, KEY_BUTTON0);
                   break;
                case WM_MBUTTONDOWN:
                   mouseButtonEvent(SI_MAKE, KEY_BUTTON2);
                   break;
                case WM_RBUTTONDOWN:
                   mouseButtonEvent(SI_MAKE, KEY_BUTTON1);
                   break;
                case WM_XBUTTONDOWN:
                if (GetAsyncKeyState(VK_XBUTTON1))
                   mouseButtonEvent(SI_MAKE, KEY_BUTTON3);
                else
                   mouseButtonEvent(SI_MAKE, KEY_BUTTON4);
                   // mouseButtonEvent(SI_MAKE, KEY_BUTTON3);
                   break;
                case WM_LBUTTONUP:
                   mouseButtonEvent(SI_BREAK, KEY_BUTTON0);
                   break;
                case WM_MBUTTONUP:
                   mouseButtonEvent(SI_BREAK, KEY_BUTTON2);
                   break;
                case WM_RBUTTONUP:
                   mouseButtonEvent(SI_BREAK, KEY_BUTTON1);
                   break;
                case WM_XBUTTONUP:
                if (GetAsyncKeyState(VK_XBUTTON1))
                   mouseButtonEvent(SI_BREAK, KEY_BUTTON3);
                else
                   mouseButtonEvent(SI_BREAK, KEY_BUTTON4);
                   // mouseButtonEvent(SI_BREAK, KEY_BUTTON3);
                   break;
                case WM_MOUSEWHEEL:
                   mouseWheelEvent( (S16) HIWORD( wParam ) );
                   break;
             }
          }

Like I said, it works. I can now assign a mouse4 to keys (mouse5 remains untested). I have no idea what I have unleashed by updating to NT 0x0500. And this all sounds remarkably to simple, I must have missed something.

Working with the Windows stuff is far outside my scope of understanding. I'd prefer a cross platform fix but since TGEA doesn't work with anything but Windows I can't do much about that (yet). I'm just concerned that I have opened up a huge can of worms by jumping up NT versions or that I have left myself open to some hole that I'll only find months later on accident and be stuck in a nightmare of debugging.