I personally find the cable interface more intuitive than the matrix patches that you find for example on the back of Arturia's miniMg. (not a criticism -I love Arturia's implementation of the miniMg). A small thing I would suggest is that a cable changes colour on the mouseover event to help differentiate it from nearby cables. The cable would revert to its default colour once the mouse cursor was no longer over it. I think that this might reduce the effort in visually following a cable from its input to output connnection.
The other thing I find deliciously inviting about the cables is the idea that one day I'll be able to plug one instance of the mmv on my PC to another instance Module By Module. So if I run out of a particular kind of module on one instance, I could use the resources of the other instance to process the signal.
One last thing about the current design of the MMV. I would like to see even more flexibility with regard to the choices of currently implemented modules. There already exists the possibility to replace, for example the Chorus with a Phaser. It seems to me that the only limitation on having both the Phazer and the Chorus available at the same time is the space on the visual interface. How about rendering the hole sizes as multiples of each other so that you could swap out 2 oscillators on the lower panel to give space for a second phazer(chorus). Relatedly, I would guess that there is no serious need to limit the MMV to a single Ring Modulator. If I want to give up a couple of slots for envelope generators and chain 3 ring mods together then I think it is better to offer the possiblity. If the issue lies with how hard the MMV might hit my PC's CPU in certain configurations, I would settle for a general disclaimer in the manual. "Warning certain configurations will be CPU intensive"
Finally, with Arturia's high quality sound synthesiser technology, they could, and I hope will produce a modern interface synth of their own design.
Sorry to have run on a bit, this was meant to be a short post.
Thanks for reading
David