Dynamics: Modifiers, prefixes and suffixes

Following on from another discussion, I found myself a bit confused by modifiers, prefixes and suffixes of dynamics.

Firstly, there would seem to be a distinction between the ‘factory’ modifiers, which are accessible in the side panel:

Screenshot

and custom modifiers, which are either prefixes or suffixes. There’s no indication of the factory modifiers in the Properties panel.

Screenshot

Secondly, you can’t add a modifier to a hairpin in the popover. Ideally, it would be great if this could be done, but as it is I spent ‘some time’ before I observed the crucial distinction in the help page:

You can input dynamic modifiers by entering them into the dynamics popover alongside an immediate dynamic or by clicking available options in the Dynamics panel.