I just tried out your plugin. Can you add a function to keep one country's links unlocalized?
For instance, I'm a US affiliate and most of my traffic comes from the US and goes to amazon.com, and I use lots of tracking IDs to see what kind of links are working and what's not. Currently, when I activate this plugin all my tracking IDs for amazon.com are changed to the one that I put into the settings removing all my tracking IDs for amazon.com. This prevents me from tracking 90% of my traffic, which is a problem.