Bay 12 Games Forum

Meph, I imagine you're aware of the 40.04 tree problems, where they drop limbs capable of soil penetration and shoot up through soil and rock.  You might want to hang onto a copy of 40.04 if you think you can duplicate this bug as a feature on certain creatures or a new megabeast.  Because a bunker buster from either above or below on anything makes it a vicious late game opponent if you wanted to up the difficulty. 

Edit:  Or, if it can't be applied to the creatures directly, you might be able to make them spawn the bugged version of the trees.  These suckers grow in about a week's in game time and are perfect for an invader to rip open defenses and force their way inside.
 

It's my understanding that most forum members consider marksdwarf training with archery targets to be bugged to the point of unusability.  I'vbe read a number of recomendations that if you want targets used to not assign barracks and schedule the squad to be inactive, or they won't fire at them.

However, I have a squad currently scheduled to train, and with assigned barracks.  I increased the barracks room size to include the targets.  And I increased the targets room size to make sure it included the armor stand and weapon rack.

Their marksdwarf skills have been steadily increasing according to Dwarf Therapist, and this is a trick I've used in the past as well to get them to fire.