HI madis ,
Thank you very much for your post.
Not sure I understood everything you said, but all seems already possible with MI apart of stock transfers.
This is something we are planning at the later stage. Maybe the end of the year 2019.
PS: as a workaround, you can use the stock logs - create a custom stock log to remove stock from warehouse 1 and second stock log to add to warehouse 2.
Hope this helps.