JohnHardly,NO NO NO.
Forexample,the Bminor chord,Richard Bridge mentioned,It has nothing to do with standard tuning,it takes advantage of your two open top strings,and gives you a completely new inversion,
likewise the Dmodal chord,with two ds on top is impossible in standard tuning .
The ordinary C chord becomes c9,very tasty sometimes.
c7 shape moved up to third fret,becomes an unusual d7 with two ds at the top,in standard that shape is d7 +9,completely different.
C7 shape up to5 FRET,gives you adifferent inversion of e7,tothose available in standard.
JohnHardly.double drop d is closer to dadgad than to standard[imo],It is not standard tuning.