yes i am swithcing maps with the car off with the exception of last night when i switched to valet with it running and it just died. that should not be problem though as stated above, u can switch rt maps with the car running.
i have the cobb OTS stage 2 as my basemap. the tuning shop only added 2 rt maps afaik. when i select "show current map" it shows my cobb base map as it should, again afaik. i'm not sure what if any changes are made to the base maps when getting a protune.