Aye, get the shammy to 70 immediately:
Spells
Spiritual Serenity, Nectar of Pain, Champion, Balance of Discord, Curse of Sisslak, Panther, Sloth, Wunshi, Yoppa's Rain, Pained Memory.
AAs
Cannibalization, RC, VP3, Call of the Wild, Ancestral Aid1, Mnemonic Retention (can get immediately), Gift of Mana1, Ancestral Guard1
If you're not needing to canni AT ALL, like you're saying, then you are NOT using your shammy to the most. Even if you are just botting him, he is
much more than a chanter with heals... Your best contribution with the shammy can be DPS. Done right including DOTs, DSes (don't forget stackable Ro's Breath and shammy DS potions), panthers, pets, rains, buffs, you can about double your SK's lone DPS, which means cut your kill time in half. And that also includes pulling 2 or 3 mobs with the SK and VP punt-parking one to the side to keep it on ice to maximize chain killing.
Boxing on one PC might have you concentrating on tanking the SK, but that's where careful tuning of hotkeys comes into play. You should be able to kill XP mobs under a minute, so that leaves 3-4 ALT TABs over to the shaman to either manually cast a spell or 2 or to hit some hotkeys:
Manual cast:
HOT, quick heals
VP
Hotkeys:
invite SK, do panther, then disband shammy
cycle panther on SK, SK pet, puppy (done before engage)
assist/send puppy
pile on 2 DOTs per mob (Nectar of Pain and Curse of Sisslak)
Yoppa's Rain x 2 (AE rain)
Also, until you get Pet Affinity to Champ pet, I'd use Avatar + Diaku + Wunshi to max its DEX for proc goodness (use Spirit of Leopard until you get Panther). Done right, you WILL be needing to cast canni a lot.
