SAS support website indicates that the SAS/Graph DEVICE driver ACTIVEX does support VALUE=INSIDE, even though the SASLOG indicates otherwise (at least in SAS 8). So, it may be that you can specify VALUE=(JUSTIFY=CENTER) on the AXISn statement to achieve your desired result. If not, I would recommend contacting SAS support for guidance and to get your interests registered with the technical staff, for future consideration.
Also, here is a Google advanced search argument you might want to use to identify SAS support website
http://support.sas.com/ resource references for your post/question:
+gchart +inside +justify +center +axis +value site:sas.com
Scott Barry
SBBWorks, Inc.
TS-602
Compatibility Document for the ACTIVEX Device Driver - Version 8 Releases
**This document applies to Version 8 Releases. If you are running SAS/GRAPH 9 or above, please refer to the documentation or online help for the most recent information.
http://support.sas.com/techsup/technote/ts602.html#BAR