Extend system events in Triggers module

Is it possible on a predefined way to extend the system events which the Triggers module are using as options ?

Right now there are:
" When either saving a new post or updating an existing post "
" After saving a new post "
" After saving an updated post "
" After deleting a post "
" When content is viewed by an authenticated user "

But for example I also wants one like:
" When content is viewed by visitor " (anonymous, not logged in)

And I can imagine many more purposes

Thanks in advance

Sincerely
Roberth Andersson

Administrator/Developer @ Jump-Gate and Webworqs, Inc
Personal page: http://www.roberth.se and Jump-Gate Projects site: http://www.jump-gate.com