Hi,
Prestashop 1.5 and 1.6 has lot of new feature in SEO,Security,Design and many more. Is it possible for your company to update your store with latest prestashop version?
But upgrading to latest version will take time and efforts.
In new version your existing problem will be solved and many new feature will be available.
PrestaShop Tutorials Videos [How to do Tasks]
https://www.prestashop.com/forums/topic/907438-prestashop-tutorials-videos-how-to-do-tasks/