v1.1 Launcher's key mapping editor is broken

Description:
Editing key mappings in the launcher's PR Mumble tab is broken. Only one mapping can be done during the lifetime of the process.

Steps to Reproduce:

1. Start the launcer from the Project Reality BF2 shortcut.
2. Go to Options > PR Mumble tab
3. Try to make two new keyboard mappings. I tried to map functions Volume Down (10%) and Volume Up (10%) to keys F11 and F12 respectively.
4. After making the first mapping (volume up -> F12), clicking the second function automatically maps primary mouse button to that function and it cannot be undone even after applying the settings and closing and re-opening the options dialog.
5. The only way to make two mappins is to make one at the time, complely quitting the launcer via exit-button and then staring launcher again.

Expected behaviour:
Program doesn't interpret mouse click that changes focus from one function to anoter as an intent to map mouse button to that function.

Tested on:
Version: 1.1.1.0