Horde Quests doable as ally with mercmode.

Borean Tundra:

Howling Fjord:
https://wotlk.evowow.com/?quest=11312 - The Frozen Glade

Grizzly Hills:
https://wotlk.evowow.com/?quest=12074 - An Expedient Ally
https://wotlk.evowow.com/?quest=12208 - Good Troll Hunting
https://wotlk.evowow.com/?quest=12763 - Shifting Priorities

Dragonblight:

https://wotlk.evowow.com/?quest=11996 - Your Presence is Required at Agmar's Hammer
https://wotlk.evowow.com/?quest=12500 - Return to Angrathar
https://wotlk.evowow.com/?quest=12040 - An Enemy in Arthas
https://wotlk.evowow.com/?quest=12059 - A Strange device (HUGE Qline if you can get drop item)
https://wotlk.evowow.com/?quest=12147 - also drop item

Icecrown:

https://wotlk.evowow.com/?quest=13227 - Judgement Day Comes!
https://wotlk.evowow.com/?quest=13481 - Let's Get OUt of Here! (after killing two scourge one Skeleton)
https://wotlk.evowow.com/?quest=13373 - Fringe Science Benefits (after chief engineer)
https://wotlk.evowow.com/?quest=13406 - Riding the Wavelength (After above)
https://wotlk.evowow.com/?quest=13374 - Armed for Revolt
https://wotlk.evowow.com/?quest=13376 - Total Ohmage: The Valley of Lost Hope (After above)

Hellfire Peninsula:
https://wotlk.evowow.com/?quest=10442 - Helping the Cenarion Post

Nagrand:
https://wotlk.evowow.com/?quest=10114 - The Nesingwary Safari
https://wotlk.evowow.com/?quest=9870 - The Throne of the Elementals (10+ Mag'har)
https://wotlk.evowow.com/?quest=11037 - A Strange Vision (Takes you to Netherstorm)

Blade's Edge Mountain:
https://wotlk.evowow.com/?quest=11036 - OUt of This World Produce! (Closes "A Strange Vision")

Shadowmoon Valley:
https://wotlk.evowow.com/?quest=10681 - The Hand of Gul'dan

Terokkar Forest:
https://wotlk.evowow.com/?quest=10000 - Un Unwelcome Presence (Entire Q line is doable?)
https://wotlk.evowow.com/?quest=10862 - Surrender to the Horde (Closes Secrets of the Arakkoa & Speak with Raliak the Redeemed)
https://wotlk.evowow.com/?quest=9960 - What's Wrong at Cenarion Thicket? (Closes A version)