Hello,
To allow your Form to be submitted to different form library, you must have rule on the field and this should be done in the Infopath form. However you might have also observed that any property allowed for editing in the Sharepoint will lose the DataValidation, Rule, Formulas, Code, Jscript etc.
So As Far As I understand your scenario will not function.
Lets see if some can Provide a solution for this.
GoodLuck
Kalyan G Reddy
Infopath MVP 2007 and 2008