Avt007, I am not a pilot but I do work on dash 8's, here is a link to an uncommanded autofeather incident that resulted in the overtorque of both engines.
The aircraft involved, G-BRYP seems to lead a hard life.
On 28 Feb 1999 this aircraft was involved in a landing accident where the crew put it on a runway with thier rate of decent at 1800fpm, the left gear fuse pin sheared and the gear folded.
On 12 Aug 1999 miscommunication between the flight crew and a push back crew resulted in the tug (one normally used for DC 10 sized aircraft) pulling the nose gear off this aircraft.
As far as a crew having to deal with an engine failure and not having autofeather available, I would hope that one of them would reach forward and pull the condition lever back to feather rather than sit there and fly into the trees.