I think any charge, be it rape or the fabrication of rape, should be held to the same standard of proof.
If I can prove beyond a reasonable doubt that a women knowingly attempted to ruin my life with a false charge of rape, I would expect her to pay for it accordingly. This shouldn't scare any legitimate plaintiff, as it is clearly harder to prove that someone lied WITH malicious intent then it is to prove that the physical act of rape occured.
Even if enacted, a law of this nature would have an almost insurmountable barrier of proof to meet, and would likely be reserved for only the clearest cases of wrong doing.
I can't imagine how that would scare anyone.