Hi Tim
The IDOC we use creates the inquiry. The simpliest way would be to have a BADI that converts the inquiry to the quote immediately. If they are adament they don't want the inquiry, then it would be more work since we use the IDOC INQUIRY_CREATEFROMDATA201 specifically for the inquiry.
We would recommend they create the inquiry then immediate convert the inquiry to the quote. This would require a BADI on the inquiry object.
Hopefully they have an OP abap person on the project?
-ginger