RE: How to add ailerons?
lopflyers - it's generally considered rude to ask a question in a thread that is unrelated to the topic of the thread. It's much better to start your own thread so that people can read it if they want to. But since you're new I'll answer you.
You can handle your situation a number of different ways. The best way is to use two different channels and set up a mix on your radio to control the two servos. That lets you reverse the one that needs it and also lets you set the centering and end points to be the same on both, which they often will not be on their own. If you don't have a mix available, you can use a matchbox to do the same thing that the mix would. If you can see that they are well matched already (doubtful but possible) you can buy a reversing Y-Harness, or do what I did to the flaps in my Ultra Stick and reverse the servo. It requires some basic soldering but there are threads here with pictures showing you how.