It says on the website no. They both stop

Bus stop is immediately to the left of the entrance way as you exit to the road. The people in the Mt Maya ticketing booth speak good English and they can explain how the bus works and give you a map the bus will take. You pay on exiting bus not entering. Station stops are obvious as you pull into them. Bus drivers can tell you if you are at the right one if you show them your map. Mt Maya is a great view with no queues so enjoy it while it lasts and the cable car rides.

Yes you can. there is a round-robin bus services at the summit mount Maya to Rokku san. I remember there is a big farm and restaurants along the route.

Sorry, I have never done yet. But seems takes at least 3 hours. Hope to you have good time!

Yes, Kobe City support to the City Tour Bus service name City Loop, the first stop is Kobe Cruise Port, The City Loop also provide the One Day ticket for visitor, we can purchase on the tour bus, the ticket price is 660 JPY for one day Kobe City Attractions which you want to go. And the conductor will be provide the city loop route map after purchased the ticket. However, the city loop bus service time from 9:40 ~ 17:30 Over the time, we just take taxi or walking to hotel or station. Hope this information could help your trip arrangement.