Vonsteubonson,

To answer your questions

1. Yes you can use a y-harness or reversing y-harness

2. The batteries can either be removed from the plane or charged in place Dubro makes a product that holds the switch and provides an external charging jack

3. On most planes you remove the line that goes to the carb for fueling and defueling you can by fuel dots or other products to allow an external (great for cowled setups) fuel hook up

4. Varies depending on aircraft engine and flying style but 10-15 mins is considered typical.

5. Futaba doesn't work with certain Airtronics Check the manual must be able to switch to neg shift. I personally like airtronics rx but have had no problems using JR. Again its a preference thing.

not to but in but from you questions and the mention of warplanes in general and the Ziroli Corsair in particular, Might I inquire as to your skill level?

Warbirds are generally a poor choice for ones first plane.