Multi-row task execution on indicium

Hi,

I'm trying to understand the multi task execution via Indicium (Universal):

https://docs.thinkwisesoftware.com/docs/indicium/multi-row_tasks.html

I’ve managed to get it working:

POST /sf/appl/subject(key)/task_dummy/stage

Returns a new location where you can add rows. For each row you call:

POST /sf/appl/subject(key)/staged_task_dummy(id)/add_context

and finally 

POST /sf/appl/subject(key)/task_dummy(id)/commit

However, the add_context step can be depending on the size quite an amount of http calls. This is exact what I would like to prevent with multirow task execution.

Is it somehow to run a multirow task in a single http call, or at a maximum of three? I've tried to run the task without staging, but that gives an error in Indicium:

 Cannot change the value of the property 'multi_row' of 'task_dummy'.The application model prohibits editing this property.

I think this is caused by the fact that the input parameter multi_row is hidden.

I can think of an alternative with an API exposed subroutine, but I was wondering if this was possible out of the box.