easing slider with editor role

Hello Everybody,

Before to go here, I searched everywhere since 2 days ! But nothing… In fact I would like to use this very cool plugin “easing slider” with the editor role…It works fine with the administrator role but there is a problem with editor role.

I found this post http://ww.wp.xz.cn/support/topic/editors-and-lower-users-cant-use-the-plugin?replies=11

but the file had to evolve because I can not find this function. In the current file “easingsliderlite.php” there is this block :

/**
     * Adds a user capability
     *
     * @since 2.0
     */
    public function add_capability( $capability, $role ) {
        if ( $role->has_cap( 'edit_plugins' ) )
            $role->add_cap( $capability );
    }

I installed “Adminimize” (=”User Role Editor” or “role scoper”) but nothing. How to do add capabilities for “editor” ?

http://ww.wp.xz.cn/extend/plugins/easing-slider/

Thanks a lot !