I'm glad to hear that you like my idea. Please remember that many other module manufacturers' modules have option jumpers so it's not just A-100 modules that would benefit from a module like this.

I have actually already DIY'd a basic (non-VC, non-LED) version for my last eurorack synth and used it all the time. My new synth is 100% Doepfer so I would love to see an officially designed and manufactured version.

I like the idea of voltage control as long as the price/size doesn't increase too much. For example I think that voltage control over the A-148's S&H/T&H functionality would be interesting, and I'm sure there are many other modules that would benefit in a similar way.

Other modules that I don't think need VC-controlled jumpers would be for exmaple A-140 and A-110 to remove them from the gate/CV bus.   

Anyway - I will leave you to your jumper research Dieter. Maybe we could have a vote once you have the total number of jumper-reliant modules

Cheers

Richard