JR cannot be connected to Futaba with commercially available cords. There are web sites that describe building your on cables to connect various brands, but I'd just buy compatible equipment.

Futaba cord round on one end, square on the other. Hitec also uses the round plug
http://www2.towerhobbies.com/cgi-bin...?&I=LXBEK8&P=0

The Hitec Optic 6 shows 'in stock' at www.horizonhobby.com and it's supposed to have more features than the 6EXA. It can be connected to a Futaba via a 'standard' cord.

If you really like the JR, and can spend a little extra, get a JR buddy box and cord to go with it and you'll have everything you need all the time.