I have a plan that is tailored for one site (domain), but can have additional where config file gets modified through control panel, but additioanl manual configurations are required if you want separate log files, etc.
Anyway, all worked, but then all additional domains started getting 500.
RewriteEngine and Options not allowed were errors.
I got it fixed with the help of support folks, by changing AllowOverride from "AutoConfig" to "All" under "drirectory" section.
It worked.
But, why I haven't had 500 at the first place?
I see there is another entry AllowOverride which was already set to "all"
I guess I'll have to configure PHP file that emails me about 500 just like I have it for 404s.
I wonder if that will work like with 404.