We decided to avoid cache the request body for file uploads in 4.0 release, it will work with all upload progress bars.
Our original plan with SSI implementation is very hard to make it compatible with different upload progress bars.
Then I think mysqli has not built into PHP binary or load as a module, you can try build PHP again and check the log file to make sure there is no error regarding this.
It is possible, but not easy, you have follow "Manual configuration" steps
http://www.litespeedtech.com/support/wiki/doku.php?id=litespeed_wiki:ruby_rails
In dispatch.lsapi you can set the ruby path at the beginning of the script.
cPanel update will not touch third party plugins, so, it should be fine, unless they change the way how plugin should be integrated into cPanel. Not likely.
You have to use two independent listeners for two SSL certificate.
So, you need a second IP address.
How is your second IP address being configured? as a IP alias? does not show up in the output of "ifconfig"?