Well the P01 is going to be 20 years old this year, so whoever was interested in LS1 tuning probably already owns a product (with unlimited licenses) to do so.
I personally last worked on the LS1 PCM in 2006 as far as code modifications goes, I think I might have forgotten it all by now
Anyway, there is pretty much no chance EFILive would revisit and enhance the LS1 offering, I know shops still tune them daily and make good money from LS1 tuning but the is no business case for EFILive to invest the R&D time in to LS1 now.