The XA10 will do just fine keying as long as there is enough light on both subject and screen background. Extremely fast movements might cause issues. Limitations? Yes. Occasional green or blue screen will work fine for most apps. If you are going to make keying your main thing, don't use a low end camera.
The XA10 might be considered Pro, but there are better cameras for keying on a regular basis with more forgiving firmware and gear.