Hello. Im sure you can buy the tickets in advance at a booth which is near where your tender will dock, however, it doesnt give you a time. You will still have to wait in the queue like everyone else. And sometimes that queue can be for over an hour. If you want to take this mode of transport then i would make sure you make your way there in plenty of time. The tenders go back and forward from the dock so there wont be a problem getting back to the ship once at the bottom

You get tendered in almost to the bottom of the cable car. The earlier you get tendered the less the line will be for cable car. Look for transportation on top of cable car to Oai.

As far as i am aware they can omly be purchased once you dock. Just go to the booth. You can only purchase one way

depends on what limit your on about but every cable capacity of 6 person

no they dont even do return always 1 way

From what I remember they are wheelchair accessible but you need to get out of the wheelchair and sit in the seat. They can slow it down or even stop it to assist people into the cars. Hope this helps.

It does not really matter if you buy your tickets in advance as it is pretty slow depending upon the number of cruise ships in the harbor.