Not quite sure what you're saying here.
Its part of their build and balance?
You want people weapons being put to the ground?
Don't put words in my mouth, please.
Speaking generally, disarming, whether it goes into one's inventory or drops on the ground, ultimately breaks the combat cycle as an intentional effect.
This is what I mean by "build and balance".
In the specific case of our world, if you're fighting and suddenly your weapon isn't in your hand, that generally creates a problem for the buffed-up, magicked-up melee attacker...which is the intent...and is supposed to motivate people to employ different tactics when fighting them (i.e. ranged, spells, unarmed, etc...)
But no, we don't want people to lose their gear because it fell on the ground. That's the reason why we even bothered to create a second Disarm (assuming my memory is correct).
We can't change bioware-standard creatures?
Sure you can... replace the creatures doing the disarm that drops things to the ground with ones that work properly, made by us. Or find the balance you want via another build path not using disarm.
You know as well as anyone that we simply do not
have room in the modules to change ever Bioware creature/item that does not please us 100%. It is why we still have "Drow" that spawn and all sorts of other things. Otherwise, all those "Drow" would have been replaced a long time ago.