You can do it in a listener and it will cover the "Edits" as well. No configurations needed in the workflow for that. There aren't any other options I guess.
That's quite strange to have to write a plugin for this basic use case. It's quite common for the initial reporter to miss the component, probably >20% and this means if even if another developer is correcting the component, it will not fix the asignee.
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What JIRA does is to define the default assignee. If the component was selected initially and the assignee was automatic, it assigns the issue based on the component. But it won't change the assignee later when component changes.
Makes sense because it is up to the assignee to make that decission whether to assign it to someone else or not. Not everyone uses components in the same way :)
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