There are already laws for slander and filing a false police report. If you aren't arguing equally for people to have prison sentences for false murder or assault charges, then you're arguing from emotion, which has no place in law or in a courtroom. Plus, retaliation for any false charges is too broad. Our legal system is set up with the understanding that we are more willing to let the guilty go free than we are to imprison an innocent man. Lots of guilty people go free, and to allow them the freedom to legally punish their victims for speaking out would just turn the law into another weapon for them.
In a way I understand what you're going for here, but I also just don't get it. I feel like this opinion is formed from a perspective that doesn't take the issue of actual rape into account. Have you taken the time to understand the psychological effects of sexual assault? Do you know the numbers of maliciously made-up allegations as opposed to honest mistakes or failed investigations? I mean, I understand simply feeling offended that someone has the ability to hurt you so profoundly. I just don't think your plan is really thought through.
I don't think the two are strictly comparable. If the allegation leads to the man being convicted, or if the man takes his own life, then her punishment ought to be harsher than if the allegation is easily proven to be false. I don't think what *could have* happened should count in sentencing someone.