No, we tried to do this, but we can't run Plura in Adobe AIR. AIR uses Webkit for its browser, but Adobe has removed support for browser plugins, including Java.
Oh, and most developers use 50% so far. We have a download app that affiliates can distribute too if they want to. We can set that to run at different numbers when idle and in use. For example, I have mine set to 100% when I'm not using the keyboard and mouse and 50% when I am using it.
Also, what is the average CPU percentage your developers run on their clients systems?