I will chime in here to try and get things organized. I'm just about to really dig into the mixture of Sonar, V700, and control 1 at the same time. I made a huge change to the analog side of my studio and I'm still waiting on a ton (26 qty) of 8 channels snakes to show up, so I'm here rather than messing with my equipment.
The main difference between Control-1 with Studio One and Sonar is not really a problem, but a choice. The choice is, the volume control on the control-1 either adjusts the make up gain of the EQ (As it was originally designed and intended) or it actually controls the fader level of the track. (As the original poster desires). The other difference is the ability to map one of the dials to an Aux send. This boarders on the controller being used as a complete controller rather than a plug in specific controller. Let's say a person wants to control an Aux send with the Control-1. What knob should that be if all are already being used for the plugs? This again depends on integration between Softube and each DAW vender.
People that do not have a set of faders will desire the Control 1 to adjust the fader level. People who do have faders would rather it works as it was designed. Even then, if you are doing mainly boosts (typical under 10K hour mixing experience adjustments), you run the risk of track/EQ processing overload (clipping). I have my 10K hours in, but with outside the box systems. Very new to ITB mixing.
Really what I desired and in part by the original post person, is an expanded version of the Control 1 that includes 4 aux sends, fader control, and the ability to run two of them at once. Linking the two with a full featured transport and stereo controls. This would allow one to eq two tracks as the same time that are fighting for the same space, or both sides of a stereo track. MS, Blumen, and other Phase related Mic pair controls would also be nice. Once you get that far, the desire for a full set of faders is almost removed because it's faster to select the track and perform the adjustments from an ergonomic standpoint. Softtube did just enough to get people there at minimum cost as a great starting point. Once you allow a plug to be in control of solo, EQ. and comp, the rest of the stuff I bring up would be nice to also get into the package. So in general, I'm suggesting Softube make another box that has stereo, transport, mic, and aux controls that is intended to be used with two control-1's. I will now submit my suggestion to softube. In that fashion, the control-1 does not have to change at all, but add another product that ties everything together. That product can then be integrated with each DAW while leaving the control-1 alone. Products take time to design, plan, program, manufacture, produce, and distribute, and have to make money while everything is going on or we don't get it at all!
I also would rather have Sonar remove bugs and clean things up rather than add new bells and whistles. That stated, the hardware surfaces available for easy integration are limited. I'm not aware of any that use RJ-45 connections and are pre-programmed for Sonar. The Nucleus came close, but priced it out of the market by including converters and it does not come pre-programmed for Sonar. if it did, I would own one. I was also hoping for Sonar to work native on an MX4 card. Never gonna happen as that format is no longer being programmed for.