So, I was fiddling with the voxel settings today, and I realized that if stealth were ever implemented, there'd be an easy way to do it.
When you set the voxel size near 0, your character becomes this shadowy figure. It would be perfect for use ingame. Perhaps, when you are prone and in the grass, your character's voxels become smaller making you less visible. This would allow ambushing and all sorts of new tactics. And your character color ring disappears too.

VS

The other suggestion I have is about vehicle explosions. Right now, the vehicles just turn blackish and wrecked. I'm sure pasik's probably considered this but perhaps a flaming wreckage that flames for a little while (~30 seconds) when destroyed via explosives. The flames have a chance to kill players that try to use the wreckage for cover. You would have to wait for the wreckage to be safe before you can use it.
Anyways, these are just some suggestions.
ComJak