As far as I know, Mullich was not programmer but then again I don't know much)

There are 3 issues left to solve for centered creatures (and some cleanup), after that the process is ready to be shipped... maybe in 2 ~ 3 versions of Unleashed, cannot tell for certain at this stage.

Extending creatures to 3x2 area can be done, but you would also need to programatically correct their actual position to be one tile further right so that the creatures appear in and block the same location as the original 2x2 creature would. Finally there are issues with changing position for seer quests and map victory conditions, or so I have heard.