Decal Limits

hey guys! I was curious if anyone knows if there's a limit on the number of destruction decals shown in game? i'm assuming there is. I'm talking about the marks on the ground from rockets or bombs simulating craters. a couple questions i had are:

1) is there a limit on how many are shown in game?

2) if so, does a graphics menu setting control that?

3) is there a time limit on how long the crate decals are shown before they disappear?

4) is there a way to mod these values so you can have, say, 1000 bomb craters after a massive carpet bombing campaign?

could make for some cool screenshots/movies

i was going to do some experiments later to see if i could find these answers myself, but thought i'd see if anyone in the community already had answers.

thanks!