I know that in the past, Gatherer didn't track dungeon nodes because there weren't coordinates or maps in the dungeons. Now, we have both available to us. Is there any possibility of Gatherer tracking nodes in dungeons at some point? They shouldn't appear on the main maps since that would just be a stack of nodes in a small space, but they could appear while in the dungeon.
Honestly, I don't see much point. There would be a lot of work involved to retrofit Gatherer to deal with instance maps and I sincerely doubt that such information would bring much value. Dungeons are generally narrow enough that you're going to spot any nodes that are up on your Minimap (assuming you have tracking active).
Some nodes can be found more easily in dungeons and looking them up in the node listing when you need a specific type of node would be useful. But I see your point. I didn't think it would be a large change considering it should be storing just location, coordinates, node type, and what you get from it. I wouldn't think that would require anything new to be added other than the location names, but maybe Gatherer stores information differently than I think. Anyhow, it was just a thought. :)
A lot of Gatherer's code is tied to the idea that any map can be identified using a combination of continent and zone number. This is because WoW didn't even expose any other reliable identification for maps until around sometime after the release of the Lich King expansion.
Since this doesn't hold true for instance maps, there is a lot of work that would need to be done in order to update the code. This is actually something that is on my todo list, but is a relatively low priority at this point.
Ah, I see. Well, I will be looking forward to when that reaches the top of your list. Having it use the newer method of locating where you are on a map can only benefit the addon.