Updating the point system in Zen Cart

Please note that Zen Cart point system is rather weird to use. System at this moment: If item costs 5,90 euros, the customer will receive 767 points, worth 0,46 euros. 35,90 euro = 4667 points = 2,80 euro. All items give points with the same multiplier at the moment. Normal amount of point you can get is x 130. Example, item costs 1 euro, customer will get 130 points, item cost 100 € = 13 000 points. I need the euros to points multiplier changed in following item categories: Juuri - Kirjat – 50 (Example: 5,50 € x 50 = 275 points, 100 € x 50 = 2000) Sarjat – Ennakkotilaukset 20 (Example: 100 € x 20 = 2000 points) Juuri – Kategoriat – Figuurit 20 (Example: 100 € x 20 = 2000 points) Juuri – Kategoriat – Figuurit 20 (Example: 100 € x 50 = 2000 points) Juuri – Kategoriat – Dakimakura 20 (Example: 100 € x 20 = 2000 points) Juuri – Kategoriat – Nendoroid 50 (Example: 100 € x 50 = 5000 points) Juuri – Kategoriat – Cosplay-tarvikkeet 50 (Example: 100 € x 50 = 5000 points) Juuri – Kategoriat – Kangasjulisteet 50 (Example: 100 € x 50 = 5000 points) Juuri – Kategoriat – Blu-Ray 50 (Example: 100 € x 50 = 5000 points) Note: * The points customer have now can NOT lose or gain value. * The quantity of points can't be higher. For example: Now item cost 35,90 €, you will get 4667 points. After change it can be 4667 or (for example) 350 points. But it can NOT be higher like 5000 or 7000 points.