Alternatively it could be called creep.shout()

AFAIK if you want to change the name you can just do something like

if (StructureNuker) {
    var StructureNukeSilo = StructureNuker;
    var StructureNukeTarget = Nuke;
}

https://screeps.com/a/#!/history/E27S4?t=9948775

Two creeps can be seen on the same tile above the spawn at this time. This seemingly happened due to one spawning at a position while the other moved onto that position.

I recently got attacked by a group of invaders, and I tried to kill all my creeps to get rid of them, since I had heard they were supposed to suicide when all creeps are dead, but it didn't work.

For several ticks you can see here there are no creeps other than the invaders:

https://screeps.com/a/#!/history/E27S4?t=969967

I think it would be interesting if, in addition to interaction with controllers, CLAIM parts allowed you to convert enemy structures into your own, rather than dismantling them after claiming the room.

This would give an extra use to CLAIM creeps which are only used for a short part of their life, and to enemy structures that are just dismantled or destroyed.

It would probably require that you own the room, or else it might be overpowered.