It will probably only appeal to developers. I wanted a quick way to turn on/off WP_DEBUG in particular.

Sometimes if I wanted to do a screen shot or video it was annoying to have every debug message shown from Plugins you have no control over. This Plugin gives you a super quick way to just toggle WP_DEBUG on/off.

I don't think I want to touch any db settings and make them editable in the admin. I could foresee a deluge of panicked support questions from people who have broken their site! That's something I really don't want to get into.

What security features would you want to see controlled via the Plugin?