Indices are for display niceness only, so index them from 1 rather than keep offsetting them. Remove SubAction, it's just JSAction now.
Rename 'stringify' to 'uid' where it pertains to unique action IDs.
Actually make it impossible to remove the default configuration. Various other small tweaks before I tackle target serialization.
Clean up manual (previously 'neutral') vs. automatic (i.e. process-driven) configuration switching.