I have built several models with two or three motors. For me i got used to using both joysticks for the tank control. At low speeds and maneuvering the "tank control" is great. For example, a wide high speed turn, say left, ease off on the left stick and keep the right stick up. If need be, use a little left rudder.
(As I also have several tanks, the radios in them use one stick for F/R & L/R. This is a combination of the up/down and left/right movement of one joystick, not to be confused with the rudder control.)
My towboat has all of the rudders (six, two "barn doors" and four flanking) and they are all linked together and the boat turns 360 in less than its own length while on its own. Her is a seven year old video of the boat doing just that:
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