By default OpenAccess does no alter your provided column names. This said if you specify them as case sensitive they will stay that way during forward mapping. You can use something similar to this:
ID = x.ID,
productName = x.Price,
ProductName = x.ProductName
And it will result in the following schema being created:
the Telerik team
Q3'12 SP1 of OpenAccess ORM packs Multi-Table Entities mapping support. Check it out.