I personally think that FS2 is better balanced and more fun to play when the Trebuchet has the tag to make it shootable.

The reason is simple- by arming trebs, you can easily take down any turret on a capship, or with patience, the whole capship. And despite it's 4 million ton advantage, it's pretty much powerless to stop you. Put the shootable tag on the Trebs, however, and if you launch them from the edge of range, they'll just get shot down. And that pretty much eliminates the easy ways to take down capships- there's still the Maxim, I suppose.
The only problem with this is that they are the single most effective weapon for subsystem destruction. The Stiletto is simply weaker, and often a pair won't finish off a turret, while dual trebs almost always will.
My solution? Just add the shootable tag to the Trebs, and jack up the power of the Stiletto a bit. Then, we might actually use the Stiletto, and we would be forced to actually ATTACK capships, whichever weapon we chose.

Any thoughts?