1) yes you can, I tried it myself. I ended up selling my version 1 including the expansion, and I am buying the new expansion though because supposedly it has better performance (i dunno how true that is) but mostly I like that it has no extra cords sticking out of it, just the one power input. i put might in a very tight space.
2) if you have version 2 of the main cellink b, you actually have to cut the cig socket out put off, there is a red white and black cable connecting it. it is sort of confusing if you don't read this before because you connect the cameras hard wire cabling backwards, yellow goes to red, red goes to yellow. but read this:
https://www.blackboxmycar.com/blogs/news/connecting-korean-dashcams-to-the-cellink-battery-b
I have connected my F770 like this and it works fine with the V2 cellink. the reason just using the cig adapter does not activate parking mode is because the thinkware cams must have an ACC/Batt/Ground connection to know when to switch to parking mode. when it detects the ACC is off, it immediately switches to parking mode. This is different from blackvue, where a blackvue camera uses the internal sensors to notice you have not been moving/driving for a few minutes, so it then switches to parking mode. once it detects you are driving again it goes back to normal recording, where the thinkwares don't switch back until it detects the ACC connection turning on again.