FreeRadius as a RADIUS server cum GPRS subscriber database

Hi All, We are evaluating whether we can use FreeRadius as a RADIUS server cum GPRS subscriber database(using MYSQL).There are these queries which we have and hence I am seeking your help --- 1>What is the rate of RADIUS msgs that FreeRadius can handle? 2>What needs to be done if we want to write handlers for START/STOP/Interim Update acct msgs?The handlers would basically extract info of the corresponding subscriber(framed-IP) from the mySQL database and send out radius response. 3>On receiving STOP msg from NAS,can FreeRadius send out notification to a particular IP?Any event handling capability existing? Thanks in Advance Sourav