Backwards:
API: No, we don't have an API for accessing config or event data just yet.
DB2/RACF: We do have agents for AIX and a third-party product that can gather data from iSeries (system i, AS/400, OS/400, whatever) systems; there might be third party agents that can also gather data from z/OS. For iSeries, the third party product syslogs the useful data our way, so if you could push this data to us the same way, we could look at covering it there, too. We do not have anything that gathers DB2 auditing data directly (i.e. connects to DB2 itself).