Generating random values for rows using a button

Hey Kat!

First, use FormulaMap() to update one row at a time (instead of updating all rows with the same value). Second, wrap ModifyRows() in RunActions() so that the doc has a chance to recalculate between invoking Random()s:

Reviewers.FormulaMap(RunActions(
  CurrentValue.ModifyRows(Reviewers.Reviewer, RandomItem(...))
))