The customize wizard allows to adjust the currently opened disposition without need to get into jOrgan's details.
Dependent on the elements contained in your disposition, some extensions offer special customization pages:
Select a wikipedia:Midi device and transpose for each keyboard. Channel, lowest and highest pitch can be set explicitly or recorded.
Select a screen device and zoom for each of your console elements.
Select a wikipedia:Midi device to control all elements referenced by a connector. Click on a table cell to record a message, if configured these are shown with a small yellow icon.
Each time a matching message is received, the corresponding cell will be highlighted in yellow.