coffee addict,
now you see how it’s possible for them to matir driving on shabbos?
The more I think about it, the more I think it is less likely that the Open Orthodox would pick driving on Shabbos as a battleground. Driving on Shabbos outside of a life threatening medical or dangerous situation has been more or less a universally accepted dividing line between Orthodox and non-Orthodox Judaism for decades. Non-Orthodox Jews are not offended by the restriction or that definition of Orthodoxy.
So I think it is more likely that Open Orthodox leaders would keep these type of restrictions (driving on Shabbos, some level of kashrus), using them as a pretense for Orthodoxy, while grinding down or pushing past other dividing lines such as mechitza, taharas hamishpacha, and marriage issues.