How to deal with the limited Linq support of OData (Open Data Protocol)

Question

I have a software, which uses a lot of Linq-to-SQL. Recently, I want to migrate to OData / WCF Data Service architecture. But I met too many problems in the Linq support of OData - it is so limited. I have to modify most of my Linq statements and test them thoroughly again.

I am wondering whether there is a system way to solve such a problem instead of my manual work. For example, by an external package.

BTW, now I have no confidence to use OData as a kind of architecture.

You are appreciated to share your ideas.

Thank you in advance,

Ying