you can paste these mapkeys in config.pro.
back up this file some where
then open any text editor and copy paste mapkeys below
general location for config.pro
C:\Program Files\PTC\Creo Elements\Pro5.0\text\config.pro
add these in your config.pro for Dimetric orientation of datum planes
mapkeys are of personal choice,you can use these if you like,there is no description for these keys,guess you have play with it and find out.
picture below is of dimetric orientation of planes,looks much better to work with and easy on your eyes when they orient.