As you say... it's been discussed.
To put it simply (and afaik), portrait mode would require individual control over each monitor, while TripleHead needs (and was designed) to treat them as one display, be it single-, dual- or triple-screen. The best you could do (if it's even possible to implement it) would be to 'portraitize' the whole display, resulting in a vertical TripleHead. :?
And by the way SoftTH is not SLI, I mean it doesn't require an extra PCI-E x16 slot, all you need is outputs - so even an old PCI graphics card would do the trick ;)
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