I see now... The thing is I see MoI UI very well designed and polished and thats one of the greatest things of the program, but i feel like this area (styles) can be improved...

Other idea: I think the drag to reorder can be useful and when you add the groups feature maybe you can only drag an style over another to make a group like folders in the iPhone haha... To rename an style you can do it by clicking, waiting and clicking again like when you rename a folder in windows or mac, thats the way the item list works in Modo too. For changing the color i think double clicking can works by clicking the color swatch twice. The issue of the deleting mechanism doesnt apply to the add one. Then the plus button can work. For deleting maybe it can work like the OSX dock and apps, when you drag an app out of the dock it is removed from it.

Again just ideas, i know you can make something great improving the styles panel!