PowerShell allows to set/retrieve web application settings e.g.
$webApp = Get-SPWebApplication $siteURL
$webApp.DefaultTimeZone
Will return the Default Time Zone of the web application.
I'm now looking for the RSS parameter for a web application.
RSS Settings
Specify the server-wide settings for RSS feeds. Enable RSS feeds: YES / NO
Not sure if this is possible to retrieve since it's not even listed:
http://msdn.microsoft.com/en-us/library/ms436104