A definite plus 1 for this. I've been asking for this for years. There's no adequate style in BIAB for playing classic songs like 'NAIMA' or After the Rain'.
In jazz terms that's like having a whole bunch of rock and pop styles where there's nothing for 'Beatles' ballads.

There is OREGSLOW, with tablas but not brushes ala but at least its the right time feel if a little too ornate and new age for Trane ballads.

In the folk section there's GOSSAMER and TJOAD used a slower tempo, but they're definitely a compromise.

Regards

Alan