Alexa Toolbar Detection (no replies)

Hi all, I'm not sure where I should post this question.

Would anyone know if there is a plugin for Piwik that detects the Alexa Toolbar? I am wondering, if Piwik detects Flash, Silverlight, and what not which sounds to me as more difficult, why wouldn't it be able to detect Alexa which is shown in the user agent string? Does anyone know how to go about creating such plugin?

Thanks in advance