Hi Iuri
as Gustaf replied, this functionality is already there. We do this every time we upgrade a system. Always test this first with a UAT system!
1. add new parameter on development environment
2. in APM, click on "Write an XML package specification", which creates the .info file.
3. Edit the .info file and increase the version number
4. Copy the file over to your UAT system.
5. in APM, click on "Install Packages"
6. choose your package, and continue with the upgrade
hope the helps
Brian