unlikely...

Very unlikely that it is possible, but..

There are many methods in my controllers that have a specific param: $webinar_id
Most of the time it is the only parameter (but not always).
Can I somehow CHECK it - ownership issue - BEFORE method executes, without altering methods themselves?

I had hopes with 'post_controller_constructor' hook.. i could even read this param via uri->segment(3) but.. can't distinguish "webinar_id" form other params... sad.