It has been acknowledged and suggested that the Kopesh is imbalanced and as such it should be nerfed to correct that problem.
Given the impossibility to revert a very poor decision that has been a part of the game for as long as it has been active, considering how the player base has become adapted to that reality and invested Heavily on that premise.
My suggestion is different.
Allowing weapons such as the bastard sword and the dwarven axe to produce Glancing blows when used One-Handed has been a worthwile Effort in making those weapons more desireable for a limited number of builds reliant on using Shields.
It is unfortunately insufficient and does not address the use of such weapons for any other builds, especially in the late game, where twf becomes the Dominant weapon style for DPS with those weapons, one of the most important factors for success in content where mobs have ludicrous amounts of HP and are utterly impervious to instakill effects.
It came to me after running a series of calculations to discern exactly by which margin the Khopesh was superior to a Racial specifc weapon choice With the extra racial enhancements to improve their damage, that if the khopeh cannot be nerfed into a balanced state, then the other Exotic weapons can be improved to reach a similar state.
My idea is simple.
Improve the damage die of the Bastard sword and the dwarven Axe to 1d12. That much base damage, especially when turned into 3d6s for Greensteel, would certainly tip the scale back into place regarding the exotic weapons. An advantage justified by the extra requirement of a Feat to use such weapons. A New feat to improve scimitars/falchions in a similar way could also be made available specifically for Elves, allowing them to succeed in the use of their Racial weapon choices, same for drow and their weapons, Same for the Bladesworn and the Greatsword.
And if that comes to pass, its also a good idea to allow damage die improvements for monk weapons such as Kamas and quarterstaves relative to monk levels for as long as the characters remain centered. If it cant be added to the current weapons, then Add the Ki Weapon magical property to the list of special effects, with those same results.
Shurikens should be improved to be more like in PnP, where they work as ammunition and therfore have improved throwing speeds, that can be adapted to ddo by allowing them to make two simultaneous attacks per throw or even three in the hands of a centered monk, as per the ability to use Flurry of blows with such weapons. A drow monk with a greensteel shuriken with its damage improved by a racial feat would be a Terrible sight to behold