I tried to combine this mod with the “NCF creature compilation by comrade kolt_av” (/topic/7937/), but it didn’t work. To be more precise, new creatures did appear on the map, but the game crashed very often. I don't know if the problem is in MCCS, NCF, or their correlation...
Another point: I tried to make the red player controlled by AI in a local network game. After loading the map, the script worked normally. Then, using the console, I "killed" the red player (Loose(PLAYER_1)). He was killed, but the first turn remained stuck (after both players had completed their turns). It's disappointing; I thought I could avoid the error this way.
I will take a look at this mod; at first glance, it is clear that there are IDs in the assembly for which some internal MCCS creatures are reserved; conflicts probably arise from path issues.
The second issue arises, as does the previous one, due to the situation when the first player is not human. This was my initial oversight; after fixing it, all such problems will disappear; for now, simply setting the first player to be human is enough to prevent these situations.