Are you using ALM? If so, there would be an alternative way by writing your own JIRA plugin.
1) Subversion ALM supports commit subscription, so you could listen for commits (from your JIRA instance) just like from a post function in SVN,
2) No yet, but I could make public the SVNKit API from the plugin (within few hours). So, you could manage SVN from JAVA and, therefore, make any commit by using Script Runner
If you are interested in following this approach, let me know and I will help you!
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