Ignacio, thanks for answering my earlier question. I dug in and also found that same answer.

I understand how different sub-types can execute in parallel, but I cannot find in the white paper if it is possible to have transactions that span subtypes. Sub a transaction would need to be executed by the slower more general consensus mechanism, but can it be done at all.

In particular, imagine if I create a game token used for cheap micro payments. could I occasionally create transactions that executed BOTH in the main coin's data space, but also in the cheap space... almost treating this sub-datatype as a lightning chain where cash can be pushed for faster cheaper execution?

Or perhaps these subtypes cannot have transactions that can read and write into BOTH data spaces in the same transaction?

Do you know?