I have build extension for new Carrier/Delivery. It's very simple and should work like tablerates in core.
I used this: http://www.smashingmagazine.com/2014/01/create-custom-shipping-methods-magento/
to create my extension.
Then I changed
system.xml similar with tablerates system.xml
Model/Carrier.php similar with tablerates Model/Carrier/Tablerate.php
Everything works nice exept.
Both tablerates and my extension use same talerates.csv or table to create price. What should I change to get it done?