I'm wondering if in a HADR cluster, if you change a db cfg parm, will that change propagate over to the standby db?

I'm testing this out right now, and I'm not seeing that capability, which would cause the databases to be out of sync configuration-wise, and quite possibly break down during a failover.

The parameters I'm trying to test with is the TRACKMOD, which needs to be turned on for INCREMENTAL DELTA backups.

Any thoughts?

The only db configs that get replicated that I know about are when you first establish the HADR pair when you restore the backup from the primary on to the standby server. Maybe there are some I don't know about, but they would have to show up in the DB2 transaction log.

Right exactly.....once the HADR pair is established, do the db cfg parms enter the transaction logs and shipped over?

Please check this URL:
IBM DB2 9.5 Information Center for Linux, UNIX, and Windows

"Non-logged operations, such as changes to database configuration parameters and to the recovery history file, are not replicated to the standby database."