Hi, nice plugin. Good admin panel!
I do have a couple of bugs or improvements to report.
1. Please review your CREATE TABLE query: rs_animstyle varchar(10) was too small for me to save some properties (effects names).
2. Inside of
rs_css I personally would like to save more styles. So instead of varchar(255) I would recommend using 'text' or so.
3. Styles for one main element only? ('margin: 0px 0px 0px 0px; padding: 0; border: none;') What if I need to apply other custom styles for .nivo-controlNav or for other elements? It would be great if I could save these styles too. Of course, I could simply add them to my theme's style.css or edit NivoSliders' themes/default/default.css but it would be handy to edit them in admin panel (I suggest to use new input field or better textarea).