I've only now learned that Timed Actionlists have a dedicated Editor. I thought that it was missing due to the actionlist entries in a creature's SAI being unresponsive.

My suggestion would be either a button that leads to the Actionlist Editor or clicking the entries would take you there.
A button would also make things quicker if a creature doesn't have a timed actionlist.

See image: Clicking any of the entries gives no feedback.

My suggestion is that there'd be a button or the entries that'd lead to the actionlist editor: