having a variable to be able to define your own package installation directory is needed. We have a situation where we rely on roles to define variables for customers, but the package on the same environment will not install if it already has been, even though it needs to be re-extracted for the role variables to be applied. Having to force the package redeployment on all projects then takes a lot longer than it should. Having the ability to add role to the path of the package directory would stop this from being an issue for us. Something similar to how you can define release numbers on a project would be ideal.

Source: http://help.octopusdeploy.com/discussions/questions/3164