More people decide (by life) to be cremated after they die. MH does not give de possibility to enter this as a alternative for burial. Ofcourse one can add the information in add. facts but to me it should be more complete to have a direct choice.
When I go to Edit details of a person on the Main tab of the person's details, I can see a few fields for death. Date, Place, Cause, Buried. In this case Buried is meant to signify the place a person was buried.
If I go to the Facts tab on the edit details screen for a person and Add a New Fact, I can choose Burial -> Cremation and add information about the cremation there.
In any case, the MANNER in which someone was buried (or not ;) is defined in the Facts section.