You don't need twins. Of course they're nice but you don't need them.
I used to ride backwards on my straight skis all the time (and these things were vintage man). I did 180s and shit. I was like 10 but still... you don't need twins.
I have a friend who used to have (up to about a month and a half ago) a pair of crappy single tipped skis (missing an edge). He did 900s and shit off BIG jumps on them, misty 7s, backflips, 720s, rodeos, etc. Of course he still does all those tricks... but proof you don't need twins. He could clean any rail (and still does on his new skis).
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