After a month of working with various support organizations, including Lotus Support, I now have two ways to disable autocommit for DB2 LC LSX transactions.

Method 1:

'-- CommitFrequency property: specifies the number of modification actions between commits. 
'-- A value of zero causes a commit at disconnect; a value of one auto-commits after every action; 
'-- any other value commits after that many data modification actions.
Private Const COMMIT_FREQUENCY = 1 

'-- Used to set the LCConnection CommitFrequency property so that transactions are manually committed.
Private Const MANUAL_COMMIT = 0

'-- Set the DB2 Connector CommitFrequency property so that all transactions must be manually committed.
If ( con.LookupProperty ( COMMIT_FREQUENCY ) ) Then
	Call con.SetPropertyInt ( COMMIT_FREQUENCY, MANUAL_COMMIT )
End If

Method 2:

con.commitFrequency=0

I've used method 1, and it works! Who-hoo!

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