Values for @status on

The values for @status on <draft-comment> are currently limited to the following: changed deleted new unchanged -dita-use-conref-target This seems unnecessarily limiting.
Is there a reason that we should not change to PCDATA?
Also, is this limited set of tokens what is permitted for @status on other elements?
How many of you all are aware of DITA implementations that have used @status?
Best, Kris Kristen James Eberlein Chair, OASIS DITA Technical Committee Owner, Eberlein Consulting LLC 
Skype: kriseberlein; voice: +1 (919) 622-1501