You will need to learn to script if you want to do anything more than the most basic tasks with HISE - or any other similar development environment.

HISE has built in cycle round robin per sampler via groups (like Kontakt). You could use one sampler per velocity layer to get RR per velocity but that would be a huge waste of resources. Realistically you will need a script for this.

You could add a background image without scripting but you will need a little scripting to get this to display as a main interface for your instrument.

If you're scared of scripting then you are not going to be happy about VST exporting, have a look in the documentation and tutorials for more info :)