I have an idea for the rule's action.
It would be great if we could define an action template so we can re-use it for difference rules.
For example: We might create a template with a set of non-final actions like:
1. Mark session
2. Update request header: [My-Custom-Key:My-Custom-Value]
3. Comment: This session is modified by Rules
Then when create a new rule, we can add an action to execute from actions template list like an illustration image.