Most of the forms you mention already have automatic sequencing. For those that don’t, a change may be coming. Read this topic: Problems with auto-reference # in combined Receipts & Payments tab.
That is what Form Defaults do. And it can be limited to the administrator. They give whoever control them the ability to set default behavior, not just business by business but form by form.
That is happening. Given the flexibility built into Manager, however, it is probably inevitable that some users who have been updating during the past week, while features related to this issue have been changing, will be affected by the final configuration. Those who wait will probably have an easier transition.