the STAGE directory is defined by the Server-Property STAGING_DIR.
So there are two things you should consider:
1.) Change the default value in the Property dictionary to your desired value in order to have it automatically set for every new server to add.
2.) Create a smart-group with all your 4.500 targets servers. right-click the Smart-Group and select "Set Property"
and then set the property "STAGING_DIR" to your desired value.
This with change the value for all servers in your smart-group.
Any job will from then on use the new directory as the STAGING Dir.
Steffen Kreis is perfecto!! and this would be the best practise rather than changing the Globally defined value( Server Property dictionary) than Local defined value( Individual Server Property)