I created a simple way to insert data using a html page with java script and PI Web Service.
This method is very simple, you just need a IE and a PI Web Service.
If you want, can put this code inside of Sharepoint with the "Content Editor" Web Part.
I don't tested this method with security options yet, but i will do this soon.
I am using the sample config: \PI Web Services\Help\Samples\web_config_basic_no_security