Hrm, glad I asked then. Wasn't thinking when I wrote that. Thanks for the heads-up.
Edit: Gave it a little more thought over dinner and was wondering about two things:
1. Don't the Vasari have some support ship that's advantageous to stack an HP buff repeatedly? If so, how does that differ from the repair ships stacking?
2. If you have multiple repair ships overhealing a single combat ship, doesn't that leave the rest of your fleet taking more damage than they would have if the ships were spreading the repair ability around? While I clearly see the silliness of a practically invincible ship, without the AI being able to constantly switch targets to whatever the enemy fleet was firing on, wouldn't this be a legitimate strategem for keeping a cap alive at the cost of having your fleet take more damage and lose more ships?
Anyway, I'll have to see this for myself in-game before it gets patched out. Reading about it doesn't do as much as seeing it in action.