Easiest solution to add some ajax to shortcodes.
After installation and activation, you will see new button inside the editor. Recommended way to use it, is to insert shortcode you need to be reloadable, then select it and click to Shortcode Ajax button. Basically, final result needs to be: [shortcode_ajax][YOUR SHORTCODE][/shortcode_ajax]
Yes, but you need to edit main file to change it. Default is 10 000ms.
It was developed with 3.1rc2. It should work with 2.9.
I really don't know that. Security was not the primary goal, so if you found something, that can break wordpress, please contact me ASAP.
I tried it. I had some problems to get it working with WP-Table Reloaded, probably caused by is_admin() check, so no shortcodes were registered and reloading tables was impossible. If you know some workaround, you could mention it.
Check plugin's main file.