Workflow actions IDs

Where are saved workflow actions IDs? How can I change them?
I see that for Default Workflow, for example Stop Working action has the
ID: bugzillaWorkflow.action.stopWorking

But in my custom workflow, the ID for an action called Promote Code the
ID is: com.ibm.chemi.team.workflow.changePackageWorkflow.action.a5

As I am going to manage such actions from code, I would like to set
names to something more descriptive.

Thanks in advance,

Chemi.