To finalize the ability to create custom space types we need an API access to OST_HVAC_Loads_Schedule objects. It will help designers to plan loads calculations directly from the architectural space program, and later use this information in energy modeling (if they need any) without tedious retyping of all data again.
Currently after creation of a custom space types the fields for schedules are empty (which is also wrong - they must be filled in by default schedules, e.g. Always On).