SCP with new parameters for autodetection
From #2 (comment 116279):
We could think of adding a new (third) parameter to SCP to specify the autodetection mode(s), rather than separate DECSET(s). I generally like this idea.
One problematic area though is to distinguish "set the default direction" (currently SCP 0 or SCP without a parameter) from "leave the default direction intact" (when there'd only be a third parameter to the redesigned SCP).