1. its actually problem on every fullscreen image slider.
2. you can change loader image if you use circle loader. you can go to appearance > customizer > loader setup > circle loader logo
3. you can use envato wordpress toolkit, you can download it right here : jegtheme.com/repo/jkreativ/envato-wordpress-toolkit.zip
4. we currently don’t have those kind of option, but we will add it on next feature list.
5. we don’t have fullscreen parallax option on section, but you can makeit heigher by adding some space like [spacing size=”200″]
or you may want to change your method, by using image inside section instead of parallax, you can add parallax as background effect.
btw i see your website inside small monitor, and i see its quite good.