We use a 2 phsed approach to handle this

each SQL server has a single ini file in the root folder of the System drive. This contains 1 [Section] that contains the datasource=, catalog= (we use integrated security only) to point to a table on a server containing the rest of the information.

That table contains 3 columns to in effect work like an ini file

Section

ParameterName

ParameterValue

I will be recommending a change though from using the C: Drive to using a DFS root of the form \\DFSROOT\SQLPARAMS\@@SERVERNAME: