Sorry if this post has already been made. Still fairly new, so I have some catching up to do.
Anyways, if you've ever played on a crowded server, you've probably run into a time where you were spawnkilled over and over again. Personally, I don't really mind, but the same isn't true for others. There have been instances were people have tried to votekick me because I was spawnkilling, and I've seen the same happen to many others.
To get to the point, I believe the best way to prevent this is a short period of "invisibility". With about 3 seconds of being invulnerable, you can A) clear the area around you and B) get into a more defended position. I know there may be some problems with this idea, but I think this would be a neat feature in Ace of Spades.