I've seen this quite a lot, but there's something that has to be addressed here.
There's many severe flaws with this system. When you come up with a suggestion, it's beautiful to dream. Dream away. Like this one dream I had last night where I was riding a flying horse into the sunset, then some bad guys came up behind me in fighter jets and I had to activate my horse-mounted heat-seeking missiles and take them down. My horse was hit, however, and I plummeted to the ground. But I activated my Horse Self-Repair System and took them down in the end. and then I woke up. None of that was real, but I can still dream, gosh dang it!
But sometimes, you can't simply give a simple suggestion such as that. Dual wielding has a ton of technical limitations. Secondary animations will need to be created for the second weapon, such as a combo for the two weapons. And before you refer to Valeyn, I was going to talk about her. Valeyn is NOT a dual wielder. This is actually done by replacing the shield with another Flourish. In battle, it doesn't do anything, it's just the exact same as a normal single weapon. She doesn't swing the second sword, she doesn't do more damage... You can do this in SpiralSpy, a model viewer for Spiral Knights. You can even view the animations if you like, but it's just the exact same thing as using one weapon.
And weapon switching will be incredibly complex. You can't just replace the shield slot with a weapon. Do we have two weapons to switch? Are we able to switch both weapons at will based off the ones we currently have equipped? Do we have two weapon wheels? I'm confused.
A system like that would take a while to code in and animate. I'm not saying it's impossible, it's just... out of our reach for the time being.
hold shift then scroll to change your offhand weapon (shield-hand) and just normal scroll to change your main weapon (sword-hand)