MOTM

If the problem with the normalized quad idea is that one might forget that
the "key" jack is a normal and accidentally cut it off, a front panel
graphic could help make that more clear. Even if it had solid lines
connecting the first jack of each quad and then a dashed line from an upper
quad to the normalized jack. 

If I get a second here I'll draw something up.

One could also do two vertical rows of say 6 jacks each and ditch the
normalization, but you lose some flexibility.