i will tell you a secret,
i have implemented it in my last v2.1 update
$precomp= ...etc etc is a mask to filter data that lz77, xz, fazip and generally any lz77 variant can compress only 5~8%, this is why you put precomp here because using precomp before lz77 can increase ratio by about 45~60% max
you can use precomp filter mask to select out uncompresable data and store using
$precomp=msc+srep+zstd this mask will allow you to select uncompressable data
for store purposes .... i have used it in my sonido mask (sonido = speed of sound )
my ultra fast mode in my tools
and yes
use can use any precomp if you put it in the beginning
for example
ultra = precomp+msc+srep64+delta+exe2+lz77/$jpgsolid=jpg+zstd/$void=srep64+zstd/$text=nz
but that will also increase time so a dual shaped sword is more like it