Which environment variable in the AEM start script should a developer modify to enable remote debugging?

A developer needs to ensure that the path /content/<proj>/segments exists on all environments with the correct initial content that the developer provides in a package. Content that exists in that path should NOT be affected.
Which import mode should the developer use in the filter definition?

A developer running a local AEM instance and working on an AEM project needs to change a large number of files locally in filesystem. The developer needs to get the changes uploaded to the local AEM instance to verify changes almost immediately in the browser.
What action should the developer take to most efficiently meet these requirements?

An application runs specific license checks against certain DAM assets every day. It should send an email to a configured list if it finds warnings, and mark the asset accordingly. A service component that uses the Apache Sling Scheduler Service is created. DAM assets that must NOT be used anymore are hidden using ACLs and the license check must re-check them.
How should a developer obtain a resource resolver that can read and update the DAM assets?

A developer needs to install a content package on an AEM environment. However a content package with the same name is already installed.
What would be the safest way for the developer to install the content package to make sure only the changes of the new content package get applied?