trunk release on factory remote

It wouldn't be too hard - you'll need a module that triggers on a double pulse.  Hook it up to the passenger door unlock wire.  When you push the unlock button the first time the drivers door will unlock, but nothing else will happen, push it a second time and the passenger door will unlock and send the first pulse to the module.  On the third push, the passenger door SHOULD unlock again, thus sending a 2nd pulse to the module and triggering a 1.0 second (or so) output.

Yep, sounds pretty easy!   :)