Additional comments to both of your questions....

Once the aileron is "nearly" straight, you can, through judicious use of a covering iron, shring the covering on the aileron more in one place than another which with skill, can cause the aileron to warp bak straight again.

As for the Trainer cord, Futaba is moving onto a new cord standard. The "features" are that with the entirely computer radios, the "buddy" box just becomes the new sticks for the instructor's box, and all the mixing, EPA, etc settings on the main control are available to the buddy box. The next most "advertised" benefit is that the plug is now a 90degree plug, making it more convenient...

The old style plug is referred to as the "round" plug, and the new style is the "square" plug.

Old and new styles are compatible with each other (can have an old or new style buddy box on an old or new style master), so long as you have a cable that is pluggable into both. There are round-round cables, round-square cables, and square-square cables. In order of availability though, it is easy to egt a hold of round-round. not so easy to get square-square, and almost impossible to find round-square.

Typically you will need to order the square style trainer cords

See http://www.futaba-rc.com/radioaccys/futm4400.html

gus