I would strongly dislike module size being standardised.

For me, the beauty of the doepfer system is its size. If i was wanted the interface bigger i would have gone for one of the 5u
systems.

Anything that makes the synth take up more space is, in my eyes, a very bad idea.

I know blanking pannels may not be the height of fashion, but they do the job for those gaps...

So far as adding stuff goes, its easy enough to fit a blanking pannel next to the modified pannel too, with your additional switches
and jacks on it, isnt it

My 2 pence worth,

Julian