I have a LinqPad C# Program that pulls data from a SharePoint List via an OData connection and I want to be able to cross-reference those items with some data from a SQLServer database.
But LinqPad does not allow me to mix those two types of Connections.

Please add support to be able to have both types of connections either by allowing OData sources to be added via the Additional Databases dialog in connection properties or perhaps introducing something similar to SQL's USE statement. Then we could USE one connection, enumerate the results into a variable, then USE the next connection to pull the sql table data.