I hope to never see this implemented.
From the client-side point of view, it would have to be opt-in, or with explicit request only. I don't want the game client to be flooded with hundreds of useless trade-guild member location updates. Not even while not in combat.
From the server-side point of view, even if this feature were per-request, everyone doing these requests (manually or via an add-on) would increase server/network load, gimping the performance for the rest of us.
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