Team Foundation Eventing Service good and bad

Microsoft people have tried their best to make Team F Create oundation Server customizable and extendible, well as far as customization is concern you can say its almost fully customizable but not still its quite far from fully extendible. Like in my case i have used Team Foundation eventing service in order to do some custom work item generation etc. but when it comes to validation there’s no easy way to do so. In fact there’s no way I can get pre-event notifications, anyway I’m still looking and trying to find someway and it seems threes no updates coming from Microsoft even I don’t see it in the next version.. So I’ll have to do some work around.. Will post here soon..