Originally posted by Yes, I have a Mic.:

I think if you could use multiple trophies on one it might be workable.
Maybe have three slots you can cycle trophies in and out of.

Build a pair of item stands next to the ballista and put the other trophies there. It takes a few more clicks but same result.

Originally posted by Reaverbait:

Personally, I think ballistas need to be redone, as they are currently they are useless. Who would ever build a ballista that targets themselves? No matter what else is done with them in terms of what they will or will not target, this has to go.

It's the norm rather than an exception that fully automated traps don't discriminate. Claw traps also won't discriminate despite also existing as allegedly magical construct.

Originally posted by Reaverbait:

I think a more obvious option is two have another toggle for "shoot flyers only", "shoot ground mobs only" and "shoot everything". This in combination with the "don't shoot me"/"don't shoot any player" would give a more acceptable range of options that might be easier to code than some sort of targeting array that would list every mob with a "Y/N" option.

There are only two types of flying enemies which can appear at the same time, drakes/seekers and bats. I don't see bats requiring use of ballista, but I can understand someone wanting to cover their domesticated animals.

Either way, the solution is to simply build more ballistae. This will also give your more ammo capacity and flexibility in selection of ammunition if you wish to spend black metal for that purpose.