Many (all?) states add allowances to scratch weight classes in certain circumstances. If you'd like, you can create a custom weight class set reflecting these allowances. There is no benefit to using non-scratch weight class sets in Takedown and some downside as doing so will increase the number of weight classes for which statistics/analytics are reported.
If you would like to document the fact that an allowance was granted for a particular event, we suggest adding that to the Notes section for the Event.
For more: Weight Class Eligibility