We use Other Work for many of the topics you raised. Projects, by definition, are tactical, have specified goals and set start/finish. Many of the topics you raised don’t have the attributes of a project.
Yes, one can use a project in CA PPM to do these things, but
For service type work, may want to consider using Services object. I like keeping things organized – Project object for projects, Services object for services, Other Work for ‘stuff,’ etc. In the end, having the data segregated, organized, is better than pooling all different types of work into projects – very difficult to “un-pool,” later. Can always combine segregated data in reporting.
Dale