"Give Me What I Want" (Obviously without the quotes, and select large biomes.) (Also, is this number: 1153638090)
Found because typing random things and not getting near what I wanted was irking me...
Works in Amidst... hope it works in game as well.
Let me know if this works for ya. I'm having fun with Amidst!
Edit: Tested in 1.3.2 install. Spawn is outside the triangle of Strongholds and to the southeast of the massive desert, but still, the desert is there. In a way, a good thing. The Taiga biome you see nearby at least has some trees to get you started.