Inventory Transactions by calling PL/SQL Package

Hello,  I know that for many inventory transactions, I can insert rows into MTL_TRANSACTIONS_INTERFACE.  However, there is a bit of a processing delay as the Transaction manager can only run as frequently as once per minute.  Using MSCA, I can process Account Alias transactions, Lot Merge, Lot Split, Container Pack, Container Unpack...etc., instantaneously.   

Is MSCA calling public procedures (APIs) that I can also call or is the ONLY solution to insert into MTI?

Thanks,

sg