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And variations on the theme of "inserting a hero into the computer's turn."
There is such an option (a button in the game) - to show or not to show the computer's turn during the turn transition.
Showing and not showing gives completely different hero classes for the computer in the tavern...
Regarding the clone: the effect of raising undead from the clone is completely nullified if, after the clone, a player or AI casts the "summon elements" spell. In this case, undead are not raised from the clone, but are raised from the summoned elements...
Damn, I had to experimentally figure out what the ban "raising undead from summoned elements" means, and I once read in Amber's reference that it was a RoE feature, and it was fixed in SoD, but whoever asks will get "a lot" of information.
Again, the mechanism of raising undead from clones of different unit stacks has not been studied (like cloning liches and skeletons in one battle - I think it won't work... but: I didn't bother checking, because it's a bug, and it would be useful for science. I think only one of the clones will be counted for one of the stacks, but how and what - I don't know.