Hi DDChris,
We haven't copied anything from our competitor, especially not states and countries so that is interesting. They were originally pulled in from official data sets per https://docs.blesta.com/pages/viewpage.action?pageId=10551368#Debugging/Tools-StatesandCountries but we are planning to make some changes/improvements here as some data has either changed or may not have been totally accurate from the original sources. Perhaps our competitor used the same original sources, I'm not sure. Also, different regions have different preferences for how the date is constructed. You can see the task we're planning to implement here https://dev.blesta.com/browse/CORE-5391 If you have any comments on this task, let us know.
Regarding that library, I don't believe this is used at all for this purpose. States and Countries are stored in the database in the states and countries tables, respectively. So, these can be adjusted there if you prefer, depending on what kind of change you want to make. Codes can't be changed to something other than a code, so changes that relate to how the address is displayed (code, or name, etc) due to the region will likely need to wait for this task to be implemented.
Cheers,
Paul