nickrose:

You can't really do that – the knob is an analog device, so just touching it can produce multiple changes. You'll almost certainly have to have a time delay based scheme, which will be annoying to some, especially those who adjust parameters during live performances.

Yes, but if it is possible to program a scheme where the first touch of a knob does not change the parameter for a certain amount of time, wouldn't it be possible to program a scheme where the first touch doesn't change the parameter at all, until the second touch appears? It would be a simple two step scenario: first touch just to see where am I, and second touch to edit the parameter.

Sorry if I'm tedious, I'm just afraid that my English is not good enough so maybe I didn't explain my idea well!