so, first thing, in ls4 we'll provide real objects not the aSurveyInfo that is a remnant of previous LS versions. So you'll can have access in an ORM way to all the datas.
For now, I just added it:
github.com/LimeSurvey/LimeSurvey/commit/...7b5321a54093a7a891e9
It will be available in next release (beginning of next week). If you can't wait, just apply this commit to your installation.
Edit the file application/helpers/common_helper.php, find the function getSurveyInfo, and add the end of the definition of the array $thissurvey, add:
Code:
$thissurvey['owner_username'] = $result->survey->owner->users_name;