well, actualy they can be put side by side, but i'm prety sure they will grow up and not to the right.
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45% HP | 60% Mana
I think it's possible, because when I've swith my horizontal player bars to vertical bars, they had been in the asked position for a short time. I think you just have to set your bars wider than higher and play with the relatives positions of bars in frame. I'll try to check this evening (if no one can check before ^^ )
If you put the bars side by side, one or both of them will fill vertically. There is no way to keep them both horizontal without putting them on top of each other.
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45% HP | 60% Mana
And I agree with you, it could be a cool layout ^^ (with each bar growing from the center, it would be even better :P )
http://www.wowace.com/addons/pitbull4/tickets/527-let-the-fill-be-a-configuration-option-rather-than/