I had a colleagues customer ask today if it were possible to change the distribution for think time in load tests.

It turns out it is, but unfortunatly not through the UI. The .loadtest generated by the UI is simply XML and each scenario you have within would have an entry like this:

<Scenario Name="Scenario1" DelayBetweenIterations="2" PercentNewUsers="0" IPSwitching="true" TestMixType="PercentageOfTestsStarted">

      <ThinkProfile Value="0.2" Pattern="NormalDistribution" />

 Simply edit the ThinkProfile Value from 0.2 for the value you require.