[bjgregory]

Can't do that in IL-2 yet without using external programs, I'm afraid. There's a program called Throttle floating about on the Ubi forums that would do that, and I believe there's some way to do it using GlovePIE. Best to ask over at the Ubisoft forums.
Dual throttle support is planned to be included in the next Daidalos Team patch, whenever that's planned to be released.