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One engine feature that might be of use to someone...

My usual obsessive skill training involves killing monsters and waiting for them to respawn, over and over again. The cavemen in the draracle caves, the bees in opinwood, the orcs in the yvel forest, the imps in the mines, the ghosts in the tower...

It looks like the game monitors the amount of monsters you killed, and will decrease the spawn amount at certain points. If you continue further, the monsters will stop respawning entirely. This also goes for monsters that always spawn when you do a certain action (push button, step on plate, step on spinner square in draracle caves to spawn cavemen, ...).