A major roadblock while making complex patches with the 301 has been for me wanting a mono signal chain up until the very end where a stereo panner is introduced.
Having a stereo everything drives the CPU much higher than it needs to be and ties my hands when it comes to adding new features.
It would be great to see an improvement in the way the linked channels work.
Being able to accept both signals at the same time would be great but I can see how it will be hard to do it elegantly.