Perhaps you could have ESU make a non-select version of the Cab Forward. If you want someone else to join you in making the request, let me know. My MTH PS-1 equipped RailKing Cab Forward is in my queue for DCC conversion and I was concerned that they only had the sounds for Select decoders.
Just to follow up, I made a request at the ESU website:
Topic: L/XL Conversion for sound project 74409
Your question:
Would it be possible for you to make conversions to project 74409 (V4.0 version for Cab Forward) so that it supports smoke and any other features of the LokSound L/XL V4.0 decoder? There are several of us who would like to use it in the O gauge community.
I will post if I get a response.