something like this? (screenshot from LDPE edited with paint)
the addition itself:
t08o800 like the existing syntax
the +/- indicates from where to start
the number states how far to go (+100 would be the same as a -100, a full quarter, no suffix needed then)
usage:
could be useful for chamfers or partially prints
if a torus gets cut somewhere
-> could still apply to prim subst