Best Practice for Managing Time Periods in Fusion

Summary

Interested in knowing how others manage time periods when set up incorrectly

Content

We are migrating away from a EBS Coexistence model to fully using Fusion.  Currently in Fusion, the payroll time periods were created incorrectly (dates are wrong).  We would like to change them, but can only modify the Cutoff Date, Date Earned, Payroll Run Date, etc. - not the pay period dates.  Since we have element entries already due to existing coexistence data from EBS, we want to make sure we don't mess it up.  

What would you recommend us doing?  Should we create a new version of our biweekly payroll with brand-new time periods, or is it even a possibility to log an SR to ask Oracle Development to fix the dates?