In the advanced edition of FTL, a number of "stunning" weapons have been introduced whose primary function seems to be stunning the enemy crew for a certain number of seconds. Additionally, some basic ion weapons and others have been given a low chance of stunning enemies.
While I can see the benefit of a weapon stunning foes as a random side-effect in a situation where I am focus-firing on a shield system and am able to delay the ongoing repairs via stun, I can't find a way to justify going out of my way to purchase a weapon whose primary effect is a stun when it suffers in other ways consequently.
For example, compare the ion stunner versus the ion blast 1:
-- Ion Stunner -- Warmup Time: 10 seconds Cost: 35 Scrap Ion Damage: 1 100% Chance to stun for 5 seconds Power: 1 -- Ion Blast I -- Warmup Time: 8 seconds Cost: 30 Scrap Ion Damage: 1 Power: 1
The Ion Blast 1 fires 2 seconds faster. The significance is if I pair two of these up, I can easily lower any level of shielding by staggering the shots. I'm not sure I could pull that off with the stunner. Furthermore, I don't seem to get the effect of delaying a repair because if I'm doing ion damage to a system (exclusively) they can't repair anything anyway! Also I'm out slightly more scrap for my choice.
A more poignant example:
-- Stun Bomb -- Warmup Time: 17 seconds Cost: ?? Scrap (Can someone fill me in?) Ion Damage: 1 System Damage: 0 Crew HP Damage: 0 (Maybe 15? I've forgotten) 100% Chance of 10 second stun Power: 1 -- Small Bomb -- Warmup Time: 13 seconds Cost: 55 Scrap System Damage: 2 Crew HP Damage: 30 Low chance of Fire Power: 1 -- Breach Bomb I -- Warmup Time: 9 seconds Cost: 70 Scrap System Damage: 1 Crew HP Damage: 30 100% chance of breach Power: 1
I won't even go into the Ion Bomb which is crazy overpowered for 1 power cost. Among these three bombs, the breach bomb is generally preferable but costs more. However, both the breach bomb and the small bomb seem to have a heavy advantage over the stun bomb. They fire far faster, deal permanent system damage instead of a single point of ion, injure the crew significantly (I can't recall if the stun bomb deals 15 damage or not), and have nice side effects of a chance of fire or a certainty of a breach! I can't see why I'd want to stun crew for 10 seconds instead of those other attributes!
Am I missing some set of tactics that involve stunning the enemy crew? What is the saving grace of the stunning weapons?