Just an idea but I wonder if we can expand the idea further and make sprinters have a chance to spawn instead of affecting all zeds in the zone. The mod is already great itself so I understand if it might be out of the scope.

it would be amazing to have all kinds of properties in addition to zombie speed, such as cognition, population density, hearing and sight distance, etc.

Hello! It would be a very good addition to the mod if its effects could be reversed. For example, let the selected area be the area of ​​walking zombies, while the entire outside area (not selected) is the area of ​​runners, something like creating safe areas where zombies do not run.

Is this a section for suggestions about this mod or "suggestions" in general?

Can we have an option to have crawlers spawn naturally as well, or would that be in another mod. (or possibly have the zombies that would normally be sprinters without the zone that spawn in it able to vault fences like players, for extra "Oh crap" goodness?)

Have you considered getting your mod to work with Random Zombies? (2818577583)
I've had issues trying to get them playing nice with each other.
But I think they could/would flow incredibly well together!