This action is actually very simple. All it does is enable and disable a player's ability to spawn. It was found because dominion uses it for last stand. The action simply takes a player to modify and a bool. True enables spawning and false disables spawning.
In KSoft, you can update your database with this
<Action DBID="139" name="PlayerCanRespawn" template="PlayerBool" />
Here is an example of using it to disable an iterator player's ability to spawn.
<E type="Action" name="PlayerCanRespawn"> <Param type="PlayerReference" varRefType="ExplicitPlayerType" dataType="Iterator.Player" /> <Param type="Bool">False</Param></E>
If you have any questions feel free to ask me!