I've found https://answers.atlassian.com/questions/33294/jira-issue-link-to-show-assignee-alsowhich is exactly what I'm looking for, the problem is that I can't seem to find the option they're talking about in Jira 6.2.
My question is: How does one add more columns to the linked issues view in Jira 6(.2)?
Ah, that's one of the few features that Atlassian removed!
The only way to do it now is directly hack the templates in the code that draw that area on screen.
See (and follow, and vote for) https://jira.atlassian.com/browse/JRA-25151
perhaps your're searching for this solution? https://answers.atlassian.com/questions/292942/how-can-i-see-subtask-resolutions-in-the-parent-task
Please have a look to the comment beneath the correct answer.
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