Expanded Origin Manager

With the new optional settings for custom origin of racial feats, I think it would be nice to have alternate choices to other racial traits that are simple to replace, without having to go the full 'homebrew race' route.
By simple, I mean damage/condition resistances and immunities, like swapping tieflings' racial Hellish Rebuke from fire to cold damage; or elven advantage on charm effects to advantage on stun effects etc.
Not talking about Darkvision, Lucky, and the likes, cause they don't seem to have simple substitutions, but damage resistance based on an ancestor (or mixed ancestry) should be simple enough to implement. Dragonborns already have that option by default!

Also, an option to simply opt out of certain racial traits without replacing them with anything at all could be nice too, to balance out the more OP choices (cough, yuan-ti, cough), or drift from the aggressive traits from stereotypically violent races.