I want to make some changes in the already existent Dota 2 map, but even when i use in hammer the existent one and save it with other name, there are a lot of things that doesnt allow me to do, like move towers to another place for example, every time i want to save it it shows some error code that towers are READ ONLY and can't be modified. There is any way to deactivate that?

I understand that the Dota map be read only to protect the original file, but since i just want to do some modifications and save it apart, there is any way to do this without being locked in so many ways?

Currently i can just add trees, rivers, units etc only those changes will save.