Thanks for your inquiry! Let me try and address all of your questions.
1. I beleive you're asking speifically about our support policy. Configuration of cPanel is not included with Basic Support. Configuration of cPanel is items such as 'How do I add a user to my WHM'. We have extensive documentation that will help you with these items. Please note that all accounts include advanced support for the first ten days.
2. Are VPS product are semi-managed. We will continue to update security in your system when we are aware of it. We also take backups of your system mightly.
3. Yes absolutely you can reboot your own server.
4. You will be able to have .htacecss on any operating system. Redhat-9 is a bit dated, unless you have a specific reason to choose Redhat-9, I'd reccomend Fedora.