Correct there is no advantange to using two separate channels for the ailerons on this airplane other than fine tuning the throws. This can be done just as well mechanically.

The external charge plug is a good idea and I always use some form of this.

In my opinion fueling ports or valves are a bad idea and only serve to cause problems at some point even running problems.

What I always do regardless of the type airplane, a simple two line system just exactlty like every trainer, Don,t even llike three line systems with a fueling dot, Seen too many people looking on the ground for a lost dot or trying to stick a nail in the hose. One less hose to leak and cause problems.

Here is how it is done on a cowled airplane: