The missing ODP from the list of available providers is a known problem which has already been fixed and the fix will be part of the next version.
Please note that in runtime OpenAccess uses entirely and only the ODP, no matter which data provider you used to create the connection string in the Domain Model Wizard. So at the moment you can just use the wizard and the Microsoft's provider to create the model, and ODP will be used at runtime. Please let us know if you experience any problems with this setup.
the Telerik team
Q1’11 SP1 of Telerik OpenAccess is available for download
; also available is the Q2'11 Roadmap
for Telerik OpenAccess ORM.