Thanks for the feedback James. This will be a nice feature and will be included in one of the next versions of Sitefinity Thunder. I don't know why you don't want to update but we strongly recommend to do so. With every new version, Thunder ships with lots of bug fixes and improvements.
We were discussing the best approach here, and reached a conclusion that it will be great indeed if we provide such an option. The Thunder extension is being actively developed and improved, and we see the need for a special settings page now, with user preferences. We are most probably going to put the option there.
Thank you once again for the feedback!