Amarican odds has been requested for quite a while. Somehow we always had something more important to do so it somehow got delayed for quite a while. But we will definitely add it soon.
Anyways - today a user was quicker and just wrote some java script lines to add it. You can just past this lines into your Java-script console (you need to open developer tools for this) and it will display the american odds format in addition. Whoever wrote it: nice job!
I am the one who wrote the userscript and posted it on your forum. Instead of having to open up developer tools and pasting the code, anyone can install Tampermonkey extension in Chrome and the @include statement at the top of the script will make the code execute only on fairlay.
Notes:
1. The script inverts the odds on the Lay side to show what you will pay if you take that side.
2. The script currently only executes on the event listing pages; once you click a specific event they will disappear. This is good enough for me, but I might enhance the script in the future when I'm bored if fairlay doesn't implement their own American odds option in the meantime.