Are you not interested developing your own plugin also?
If interested, you can write workflow postfunction as a workflow module in your existing self-developed workflow plugin.
if you have any doubts, you can revert back.
There's now a very easy to configure way to transition parents and sub-tasks in sync using Automation for JIRA!
(this example transitions sub-tasks, but you could just as easily change this to transition the parent as a result of a sub-task being transitioned)
You could configure a rule that simply checks if all sub-tasks are closed and then transition the parent to a given step using the related issues action.
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