Well, about the poisonous saliva thing....
Despite the fact that in ASM # 6, Lizard said that he had the powers of ALL the different lizards in the world, that concept was actually kind of dumb, and Lizzy never made that claim in future comics.
Obviously Lizzy doesn't have a big frill like a frilled lizard, or a super-long sticky tongue like a chameleon, or poison glands like a gila monster, and that's just fine with me. Curt doesn't necessarily have to turn into a Lizard that looks just like the lizards he experimented with, and similarly Lizzy shouldn't have TOO many different lizards' characteristics or abilities.
Let's just stick with wallcrawling, agility, super-strength, claws & teeth, tail-whipping, and MAYBE mental control over other reptiles, although there isn't really a need for that in NYC.