Currently, the macro allows custom titles, which is good!

But, the title style is locked at H2, which is limiting.

See this page: https://confluence.atlassian.com/display/STASH/Stash+upgrade+guide

In this case, to have the TOC macro display the "Upgrading to Stash x.x" items, without the "Known issues" headings, the former headings have to be made H3, and the TOC macro set to ignore H2.

This achieves a useful TOC, but mucks with the heading levels of the page... what is needed here is to be able to set the JIRA issues macro title to H3 or H4.

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It appears the H2 heading is only locked when the JIRA issues macro is being to Static style.
When set to Dynamic, the title will take over the heading as used within the macro itself.
Additionally, when set to static, the title appears to fall outside of the macro window, where as it stays inside when set to dynamic.
The issues-subheading class is set to H2, so custom css will not provide a solution here.
This has been tested with version 4.0.29 of the JIRA Issues Macro.
The version 4.0.17 does not appear to show this behavior