Can ufo: dummy be used to spawn any terror mission?

[The Martian]

I've noticed that when running a TFTD campaign (Especially with 'Maps from the Deep' map pack.) after a while the aliens seem to stop spawning terror missions. What I believe is happening judging by the log information in the save game data is that all alien craft that are trying to spawn a terror site are being shot down.

To keep up mission variety I'm hoping to prevent this by using the alienMissions: STR_ALIEN_SHIP_ATTACK waves: entry of

Code: [Select]

      - ufo: dummy #don't spawn a ufo, we only want the site
        count: 1
        trajectory: P10
        timer: 0
        objective: trueWhich instantly spawns a terror site with no alien craft that can be shot down.


However before I make the attempt I have two questions I'm hoping someone can answer.

#1
Is ufo: dummy hardcoded to STR_ALIEN_SHIP_ATTACK or can I use it for anything?
(I checked the Ruleset Reference but didn't see any mention of how dummy was used)

#2
If I alter all of the alienMissions: waves: terror missions with the above fix will it brick or corrupt my existing save when I update the mod?

I'm getting close to the end of the TFTD campaign and I'd hate to have to start from scratch.