If you click on Testimonials on the left to give you the list, there is a Delete button on the right hand side of the screen. Sorry it took so long to respond. I got the email but then it was buried and I forgot about it. :(
I agree. Adding in more anit-spam measures is on my todo list. 1. Being integration with Akismet and then a few other tricks.
Unfortunately my house was flooded in the Colorado floods and I lost my main computer equipment so this update is taking a bit longer than I would like. It will be released though.
Another fun fact. I thought about NOT adding in the form shortcode specifically because of potential spam issues but decided the plugin would be better with it.