Allowing Gold but not Lumber Trade?

Hi, I'm trying to set it so that gold can be traded as usual, but not lumber as it will be used for something else. Is there a way to disallow lumber trading while still allowing gold trading?

Also can someone tell me how I can change the, 'You don't have enough lumber' sound that automatically appears when you don't have enough lumber? I just want to turn it off or change it.

Thanks in advance,
TR

You can set the "amount transferred" for lumber to 0, under Advanced>Gameplay Constants.

I checked there already, and all I can find is Ally Trading Increment - Control Click, and Normal Click. Thus I can set both gold and lumber, but not each one seperately. I can't find what you told me anywhere in the Gameplay Constants.

You could always disable the whole resource trading and do the gold trading in some other way... Apart from that, I have no other idea about how this could be done, you are talking about fiddling with the game interface, your options there are limited (unlike with triggers, where they are limitless :).