Provide a connection directly?

Is it possible to provide Toplink with an actual JDBC connection instead of connect parameters?
The business model I'm trying to construct will work inside an existing application which does direct JDBC. There is already a connection open and it would be a waste of resource to have two. I can always hack together a special Driver for this.
One concern: in the debug I see many "connection disconnected" statements at the end of a simple test. How many actual JDBC connections does toplink open?

My concern is growing.
What does me eye goggle in a testcase here: when a new object is persisted, the insert is executed immediately, from the looks of it in a dedicated write connection within a transaction. I had hoped Toplink would hold the objects and then burst-SQL upon commit.
I vagely remember non JPA Toplink had this behaviour, but it was many winters ago. This means I have to code that behavior myself.
But I also goggle that for one simple select and insert a whopping 7 connections are closed at the end.

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