We plan a general system of flags for the new configuration backend. For example, one long-standing idea is an “ephemeral” flag that will cause the system to omit nodes when saving the config, so that VRRP transition scripts can safely insert temporary configurations without worrying about altering the permanent baseline config.
A display omit flag is also a good idea. It will only be possible after the last bits of legacy code are gone, though — but that’s pretty soon now, there are only two legacy components left in 1.4!