A cron job and a cron tab are pretty interchangeable, I think.
I agree, assigned to CORE-791 - thanks!
I'll see what we can do about that, there is definitely room for improvement here.
Not sure why that is, your web server isn't doing any caching is it? Can anyone reproduce?
Forcing HTTPS was actually added to 3.1. We need to split the documentation for 3.0 and 3.1, and will be doing that shortly. Often times we have people asking how they can force HTTPS for their Blesta installation. It's a good idea to use SSL whenever possible, especially when personal and financial information may be at risk. Since not all servers have SSL, we added the rule and commented it out so that it can easily be enabled.
If your cron job is set up and running, then installation is complete. I suggest checking out common tasks in the manual http://docs.blesta.com/display/user/Common+Tasks for what to do next. This forum is also a great place to ask for help!
Thank you for your suggestions!