Idea Summary
Declarative way for calling other dynamic actions without javascript or needing to declare the dynamic action as “Custom”.

Use Case
Many times you define dynamic actions for certain events, like click, onchange etc, but you want also call its logic from another dynamic actions. A way of achieving this is declare it as custom, specify a name and always use javascript for calling this dynamic actions. This would not be needed if we had a speciall dynamic action of type “Call dynamic action”. 

Preferred Solution (Optional)
If would be nice having a “Call dynamic action” action, with a select list with the current dynamic actions in current page.