This simply replicates the flat rate plugin that already exists. Nothing is overwritten and VQMod is not needed. This gives you 4 more spots to add flat rates for shipping. So you can use each one for different Geo Zones or different Tax Classes.

Please do not request support in the comments.
Go here for support for this plugin:
http://opencart.rocks/contactus.php

View Demo at: http://opencart.rocks/demo/
View Demo Admin Area: http://opencart.rocks/demo/admin
user: demo
password: demo