Weighted Knife should activate by holding the melee button
Afaik it’s now a melee ability with the longest activation that otherwise doesn’t have other prerequisites (like say sprinting). And that tends to screw you up more times than necessary.
Say your cursor is not directly pointing at your enemy or you’re anticipating an attacker to get within range on activation, so instead of a quick melee you throw a knife and can’t do anything else while the lengthy animation is playing out. That results in many unjust deaths were it pve or pvp.
Hence my suggestion is to add an alternate activation method for weighted knife to separate it from uncharged melee. And that is by holding down the melee button. Similar idea to how handheld supernova is activated for nova warp warlocks.