1. Disable the spawn of INDIVIDUAL creatures (e.g., if you don't like Zenitals from a pack, disable their ID).
2. See that 2 creatures are occupying 1 ID - transfer them to another using the program.
And so on. Honestly, I'm not sure if it's possible to create something like that, but this program would significantly simplify NCF modding. Why am I asking? There's RTMG, and some other features are implemented there; you can edit creatures, move them to a castle...
UPD: OMG... Well, this is just 18+... The first matches have been found. Dark Paladins and Shadow Guardians in the sequel to Hancock (those who watched it may understand). Now you have to find a free slot((((