When I started playing (which was only about a week ago, I guess) I didn't know what quickkeys were, or I didn't think I should bother to use them, so the only benefit I got from juggler was the instant swapping with a prepared weapon. Now I realize that you can use juggler to instantly swap to any weapon from your inventory, as long as you have a quickkey bound to it. The problem that I have with this is that to get the full benefit of juggler, once you start using assemblies and uniques that don't have a quickkey by default, you have to save your game and edit the quickkeys configuration file to assign keys to your new weapons. I feel that the full benefits of juggler should be accessible from within the game itself. How about we just change juggler's functionality to, "You can now swap your weapons or equip any weapon from the inventory instantly," as this is effectively what the trait already does?
Or, if that seems overpowered when it's written out like this, how about "You can now swap your weapons instantly and equip weapons from the inventory in 0.5 seconds?" I think this would be interesting, as then there's still a major benefit to having a sidearm in your prepared slot rather than in the inventory, and the player then has to consider whether it's more important to equip a second weapon (for faster swapping) or ammo (for faster reloading).