I can confirm that separate terminals will work if setup correctly but there are some aspects not optimal such as staff job allocation. Staff is not aware of two security areas and might take a job in terminal B while being in terminal A. So you need to have a walkway in between them but this is not necessary to be secure. Regarding check in desks you can assign them to the cargo bay attached to the stands in terminal A, that way you can also control which check in desk will be used for flights on a particular stand. Another thing to think of is the bus stops which don’t have any logic around terminals so passengers will spawn at random bus stops so you need to have walking access to both terminals. So even if multi-terminal is not 100% supported by us yet, it should still be possible. 
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