I am amazed the CV and Gate busses have not been adopted by more Eurorack makers. Almost ALL of the CV and Gate producing modules that we make have jumpers inside to select its use or not. The ones that don’t are because of size constraints (the 16-pin header is hard to fit on a 4HP module). I personally have made the mods that Dieter mentioned wherever possible in my rig. In some cases with other companies modules, I had to replace a jack with a normalized one but in the case of Doepfer modules, all the jacks seem normalized.
Dieter - one thing that can be annoying when making the mod on some of the older modules you make, on many modules the unused normalized pins on the jacks are connected to the regular pins and can be a problem to cut. If they happen to be under the jack it is even harder. I wish that when normalized jacks are used as input jacks (which I would love to see in all input uses) that makers would just make that PCB pad bigger or go to a blank square or something to make soldering to it easier. Back in the day I used to sell E-Mu modulars from a store in Seattle and one thing I remembered form them is that every input and output jack was normalized and the switching pin of the jack went to a molex pin on the PCB so yo could make custom normalization any way you wanted. This was a added expense that would be a burden to many makers, but a un-drilled pad on the PCB cost nothing and the DIY crowd would LOVE you for it.
-James