Basically I would like to have this but instead of only tracking world quests that have reputation as an explicit (bonus) reward for a specific faction I would like to be able to track every world quest from a selected faction, i.e. those that would contribute to their faction's Emissary quest if there was one. I am aware that some quests count for more than one Emissary but for my purposes it would be sufficient to track the faction appearing in the world quest's tooltip even if it counts for another emissary or has reputation as an unlisted base reward for another faction. Tracking the latter would be nice to have of course but I assume (please correct me if I am wrong) that you would have to maintain a whole world quest data base to be able to do that.

I would specifically like to use it for the Azerothian Archives world quests in Dragonflight as they are spread across multiple zones and easy to miss as they are not distinguishable from regular world quests in the zone without checking the tooltip (unless you have memorised their exact position on the map and can identify them solely based on that). There are not too many to add them as custom tracked world quests but I originally thought that tracking by reputation rewards worked like this and it might be useful for other purposes so I decided to submit a feature request.

I think as a workaround for the Azerothian Arcives you could track the Mysterious Fragment currency.

But yes, in general tracking by faction is a good idea.