I posted this in a different forum, and somebody kindly guided me here, saying there'd be interest:
I'd be pleased to discuss here, and I've got a web site where I'm building and shipping these... but I know there are rules around here about selling.I was not happy that my brand new 06 Legacy wagon did not have what is now a very common feature "retaining accessory power" that keeps things alive for a while after removing the key. Later I found this very fact had been noted (on Edmunds!).. as a "minus" for the car. I found out later this problem also applies to the new Tribeca, which is embarrassingly worse for a higher-yet-end vehicle!!
Long story short: I made a black box module that wires in under the dash to give the car retained accessory power after removing the key for a selectable time (2 to 16 minutes.) Does the job nicely.. It has options for killing accessory power, since I don't like it when opening the door kills power instantly - because often I'm out of the car then realize I need to jump back in and use a power accessory... I made it that when you LOCK the car cuts power. And along these lines, I made it that pressing UNLOCK breathes life into accessory power - the radio comes on and is playing when you hop in which is kind of novel.. but also lets me use other accessories without ever having to put a key in the ignition! .. it powers off after a time, or locking the car again.
I also found a one-wire way to get power windows to work when Accessory power is on (instead of requiring ignition power to be on).. Also applies to sunroof on wagons.. so now I can use windows during retained power time. This one-wire trick also applies to Tribecas!! After studying the electricals between these two vehicles, I can see where Tribeca started from - the Legacy.
I've posted the brainpower on doing this elsewhere on another forum, legacygt.com I also offer install kits on a website if you don't want to make your own but buy a complete and tested kit ready to install, with Legacy and Tribeca instructions.