To use [+as.intro+] instead of [+as.pageTitle+], in the version 1.7.1 you should change the line 194 in the file ajaxSearch.php and line 499 in the file includes/snippet.ajaxSearch.inc.php. Define [+as.intro+] in the template and change the code lines.
But, I will deliver the version 1.8 of AjaxSearch, this week. This new release will offer a better templating with the use of PHx. So, except if it is urgent, I suggest you to wait a lot.
Find enclosed, the 1.8 readme.txt in preparation (draft version).
Excellent! Thanks for the tips as well as the information about the new release. I can wait a week or so for the new version, so I think I will take you up on that suggestion.