Is it possible to stagger user startup in a replay test? (4270564)

I ran a set of replay tests, and monitored the CPU utilization of the database server. I noticed that for all but the single-user tests there are two CPU peaks, the first of which is probably associated with logging-in the users.

I would like to repeat this test, but staggering the start-up of the ten users to remove the initial peak, to see the effect on the subsequent CPU load.

The replay test does not offer the User Startup option (eg start a new user every 8 seconds), which is only available on the Timing tab, itself found only in the Mix and Goal tests. I can copy my original Replay test to a Mix test, but this test will then be limited by time (whatever presampling and sampling times I choose), whereas my replay test was limited by the number of executions - in the example above, ten users each running the query once.

Is there any way that I can run my query for ten users, once each, but with users connecting to the database at, say, eight second intervals?