Unfortunately, the support of Pervasive PSQL is not in our current back log.
However, we appreciate your suggestion and I advice you to publish it on our Ideas and Feedback Portal
where our users can vote about it. Once it gathers the approval of the rest of the community we will consider putting it on our road map.
If you have any other questions or suggestions, do not hesitate to get back to us.
All the best,
the Telerik team
Q3'12 SP1 of OpenAccess ORM packs Multi-Table Entities mapping support. Check it out.