I am looking for a good solution to override the Magento config without changing the default values.
For example, I want to override the \"web/unsecure/base_skin_url
If you want to overwrite some special config data, you can put it in app/etc/local.xml. But thats only useful for your own shop, not for public modules.
Heres a way to overwrite the base_url
for development-purposes without altering the database.
...
http://dev.myshop.com/
http://dev.myshop.com/
http://dev.myshop.com/
http://dev.myshop.com/
...