You're saying the radio won't bind to a particular DSM2 receiver because of the way the receiver is set up.
So my radio should bind to an ordinary DSM2 receiver, right
I'm saying the RX and TX *will* bind, but when you move the sticks the control surfaces won't move the directions you need it to.
For any airframe where the surfaces are the standard 4 channel format (throttle, elevator, rudder, ailerons) and the servos are set up to travel the right directions without needing to be reversed, your radio shold bind and fly that airframe without modification. If the surfaces require mixing (like elevons -- a hybrid between ailerons and elevators) or reversing direction (rudder stick left but the rudder turns right) that radio won't be able to help you.
Teh 4 channel DSM TX's also aren't full range -- they'll do fine in a small feild, but they don't have the power of their bigger siblings.
The DX5e (the next step up in the Spektrum TXs) will alllow you to reverse any servo that's moving reverse, and it can switch to a very basic elevon/delta wing mix. The DX6i (or the Orange T-6 knockoff) will do that, plus give you dual rates, limits, expos, and custom mixes (like adding a little up elevator when you throttle back) -- those might not seem that useful, but if you're gonna stick with this hobby, I wouldn't suggest anything without the basic features the DX6i has.
In the mean time, if you're careful how you mount your servos and pick up a Spektrum/OrangeRx/LemonRx receiver, you can use that radio to fly all of the Flight test planes *except* the FT Delta and FT Versa (And the Krakken if they *EVER* get around to releasing plans . . . ). They use elevon control. everything else uses RET (rudder/elevator/throttle), Bank-n-yank(aileron/elevator/thottle) or full house (all 4 in standard setup), though you might need a servo Y for the dual servo ailerons (like the Spit/Racer/Duster).