I realize that it's been awhile since this question was asked but the only I found to access CS757's "offsets" or key commands is to break down the cab and look at the xml's and look for the L:xxxxx of interest and then assign whatever keys to the L:xxxx using the <On key="yy"> in the xml. Or produce an FSUIPC's lua to assign keys or buttons to access the the L:xxxx. Or, the easiest, use FSUIPC to assign the Lvars to a *.mcro file and then assign keys or buttons as required to the associated mcro number (this courtesy of A2A simulations forum).