Well if you poke around in Torque you can find a menu item that options you to turn off the OBD Link on power off (even mentions it by name) for you. I opted for that and did not worry about it further. I think it's in the dash permanently installed menu. If you can't find it, let me know and ill try to provide a better clue. The slow blink blue light is still on when the ignition is off, so I don't think there is a visual cue that it is off. After start up in maybe twenty or thirty seconds the activity ....lots of fast blinking lights come on when the OBD dongle starts waking up and a few seconds later, the gauges come alive. This is usually as I'm backing out of the garage.
I think I may have finally solved my Nexus 7 charging issue. I'm testing now but it looks real promising. Fingers crossed. If this is it it will be another classic example of stupidity on my part....as usual. My next project is to elaborate on my mount. Functionally my mount has been everything I wanted. I have noticed however that mounted high on the dash as mine is, there are times when harsh light has reduced visibility. I added a matte screen protector, but that has been only slightly helpful. I'm going to cosmetically remake the mount to give me an overhanging lip on both sides and top. I think I can make it look even more built in and shade the display surface from glare as well.