Magento: Change the sort order on product category

Hello, I need someone with good experience in Magento to extend the way the "most views products" works. I'm using Amasty's Product Sorting extension ([login to view URL]), and I'd like to improve it by mixing "most views" with "bestsellers", in order to to change the sort order in which the products are listed in the category. MOST VISITED Amasty's extension already sort the product order based on most viewed products Situation A : Product B = position 1 ( 150 views) Product C = position 2 ( 100 views) Product A = position 3 ( 50 views) SALES Sales should also influence this position , then we must consider that each sale counts as X visits (configurable parameter) to that product also. The sales period to be considered should be the same that Amasty uses to count the most visited. Situation B ( 1 sale = 100 visits ) : Product C = position 1 ( 100 views + 1 sale) Product B = position 2 ( 150 views) Product A = position 3 ( 50 views) MANUAL INFLUENCE One last way to influence the position is via manual manipulation . You must create a new attribute for the products , where I may be able to insert positive or negative value , which will serve as an accounting more visits. The idea is to promote or demote products. Situation C ( 1 sale = 100 visits ) : Product A = position 1 ( 50 + 500 visits manually ) Product C = position 2 ( 100 views + 1 sale) Product B = position 3 ( 150 views) REMARKS 1 - Cancelled sales should not be counted 2 - Every time service runs, must be generated a log file saying that everything ran ok or if there was an error, and which error. And in case of error send an email too. 3 - The service must be scheduled via cron job , but there should also be a manual way to execute it, can be either by an specific URL or a button in the Admin . 4 - The developer should implement it in the test server , and once validated , apply on the production [login to view URL] required: Magento, MySQL, PHP