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I ran across a couple of very useful cmdlets I have not noticed before that allow you to retrieve and even update OpsMgr Global Settings! You could also use this in an OpsMgr Global Settings auditing MP, using Stefan's guide R2 PowerShell monitoring as a guide. While OpsMgr 2007 does not provide the names of who changes management group settings, this seems like a good way to audit any changes.
To Retrieve All Global Settings
The get-defaultsetting cmdlet, run with no arguments, will return a list of all the OpsMgr Global Settings (names and values).
To Retrieve a Particular Global Setting
This one will retrieve the current value of the AlertAutoResolveDays setting – the day after which unresolved alerts are automatically closed.
get-defaultsetting | where `
{$_.Name -eq 'ManagementGroup\AlertResolution\AlertAutoResolveDays'}
While this is an interesting cmdlet, it's seems to be written for reading. There is a separate cmdlet just for updating Global Settings values.
To Update a Global Setting
This one-liner (updated to wrap lines) will update the Alert Auto-Resolve Settings in OpsMgr Global Settings, updating from the default value of 30 days to a value 25 days
set-defaultsetting `
-name ManagementGroup\AlertResolution\AlertAutoResolveDays `
-value 25
Conclusion
Hope you find this helpful. If you do any sort of monitoring or scripting with these cmdlets, it would be great to hear about what you're up to.