We have added a new distribution type called “Absolute”.
When you are creating your test plan, by default, your distribution will be selected as “Absolute”. If not, then select it from the “Test Distribution” drop down and resubmit the “Test Settings Wizard”.
Note that this new distribution type only uses the delay provided in the first line of your test plan details grid.
Which in you provided picture would be (1 rUser every 10 sec):